PHILADELPHIA -- Theres a reason why Ryan Howard was limping around the field. The Philadelphia Phillies slugger needs surgery to repair a torn meniscus in his left knee and will miss at least six to eight weeks. An MRI on Monday confirmed the tear in his knee. A date for surgery hasnt been set. "It could have been much more significant damage," general manager Ruben Amaro Jr. said. "We dont want any of our players on the DL. But we know what it is and its treatable. Hopefully we can get him back in time to play this year." Howard, the 2006 NL MVP, went on the disabled list Saturday. The three-time All-Star was hitting .266 with 11 homers and 43 RBIs. He was noticeably hobbling during games before he was shut down. He said he continued to play through the pain because he thought he could perform. "We have to take care of it," Amaro said. Howard played his first game last season on July 6 after tearing his left Achilles tendon making the final out in the 2011 NL division series. The 33-year-old first baseman has been on a steady decline since signing a $125 million, five-year contract extension on April 26, 2010. Howard averaged 50 homers and 143 RBIs between 2006-09. He hasnt hit more than 33 or driven in more than 116 runs since then. Darin Ruf, who hit 38 homers at Double-A Reading last year, replaces Howard. Ruf had been playing left field in Triple-A. Howard is the latest star player to land on Philadelphias disabled list. Chase Utley and Carlos Ruiz missed significant time and Roy Halladay remains out after having shoulder surgery. Backup catcher Erik Kratz had surgery for a torn meniscus on June 12 and already has started a rehab assignment, so hes ahead of schedule. "Hopefully we will have the same sort of time frame, but everyones knee is different," Amaro said, comparing Howard to Kratz. "We can only speculate the length of how long it will take to get him to rehab. Well shoot for the conservative one and hope he comes back faster." 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Whisenhunt said he hit it off quickly with Ruston Webster when interviewing for the job Friday night.Ferrari confirmed their fast start to 2016 testing by setting the pace again on the final day of the first Barcelona test - but McLaren ended the week with fresh reliability concerns. After being knocked off the top of the order by Force Indias Nico Hulkenberg on Day Three following Sebastian Vettels eye-catching start, Ferraris radical SF16-H returned to the head of the timesheet in the hands of Kimi Raikkonen as the Scuderia again flew on Pirellis quickest tyre.Raikkonens morning ultrasoft-shod time of 1:23.477 was 0.816s faster than Red Bulls Daniil Kvyat could manage on the same compound, but came up short of team-mate Vettels 1:22.810 from Day Two. Vettels lap therefore stands as the fastest time of the test. The car feels nice and we have got lot of things to try and test and tune, but this is definitely a step up from what we had last year, said Raikkonen.But while Ferrari ended the week where they started it, great rivals McLaren ended up where they hoped not to return in 2016 - the bottom of the timesheet. Sky Sports F1 writer Will Esler is joined by Ted Kravitz to review the first test Mercedes trial S-duct nose on the W07The MP4-31 had run reliably on the opening two days at Barcelona but fluid leaks restricted McLaren to just 54 laps across Wednesday and Thursday - a measly three of which were racked up by Fernando Alonso on the final day. After a hydraulic leak had cost Jenson Button most of Wednesday afternoons session, Alonso took to the track early on Day Four but the car was soon struck down by a coolant leak and, despite the teams best efforts, never returned.McLaren, who had prioritised distance running for this week, ended the test second bottom of the mileage charts.To compound McLaren-Hondas latest woes, reliability was easier to come by for the rest of the field with Renault in particular making up ground after a difficult start to their week.Kevin Magnussen completed the most laps for any one driver - 153 before the RS16 stopped on track late on. The Dane also showed good pace, finishing fifth fastest with Force India development driver Alfonso Celis fourth.Seeeing the problems on the first two days it was concerning and I was worrying a bit about getting as many laps as I wanted - but Ive certainly got that now, said the Dane at the end of his first week back as an F1 race driver.ddddddddddddIts been a really good couple of days. Its been perfect in terms of getting back into it. But, for the fourth successive day, no team topped Mercedes mileage as the world champions again split their running between Lewis Hamilton (99 laps) and Nico Rosberg (86 laps). They finished the test just shy of 2,000 miles.And while their pace may again not have caught the eye, additions to the W07 did as the team debuted a new nose and downforce-assisting S-duct.Its a really exciting time for us, Hamilton told Sky Sports News HQ. Ive never had a week like this when the car has just kept going on and on on. Its been physically challenging. Its been incredible. Im so proud of my guys. After two really successful years its really easy to drop the ball and be chilled but everyone has worked even harder than before - which we thought was impossible.Hamilton: Rosberg rivalry is realToro Rosso and Sauber - giving the final send-off to their 2015 car ahead of the C35s arrival at next weeks second test - also topped a century of laps to finish fifth and sixth on the timesheet respectively and ahead of both of Mercedes drivers. After an impressive first week in F1, Haas attempted a race simulation with Esteban Gutierrez but were stopped in their tracks by first a red flag for Manors Rio Haryanto - who spun into the barriers at turn five - and then a stoppage for their own VF-16.Day Four timesheet1. Kimi Raikkonen, Ferrari, 1:23.477, ultrasoft tyres, 80 laps2. Daniil Kvyat, Red Bull, 1:24.293, ultrasoft tyres, 96 laps3. Alfonso Celis, Force India, 1:24.840, supersoft tyres, 75 laps4. Kevin Magnussen, Renault, 1:25.263, soft tyres, 153 laps5. Max Verstappen, Toro Rosso, 1:25.393, medium tyres, 110 laps6. Felipe Nasr, Sauber, 1:26.053, soft tyres, 121 laps7. Nico Rosberg, Mercedes, 1:26.187, medium tyres, 86 laps8. Lewis Hamilton, Mercedes, 1:26.295, medium tyres, 99 laps9. Felipe Massa, Williams, 1:26.942, medium tyres, 54 laps10. Esteban Gutierrez, Haas, 1:27.802, medium tyres, 89 laps11. Rio Haryanto, Manor, 1:28.266, soft tyres, 51 laps12. Fernando Alonso, McLaren, No time, 3 laps. Conclusions from F1 testing Have Ferrari and Mercedes moved further clear of the field? Every race live in 2016 Sky Sports F1 brings you every race live in 2016. Fast and easy online upgrade - click here. Also See: F1 gossip column Every 2016 race live ' ' '