If you can't believe it, the terrible moment that Lisandro Martinez experienced

Manchester United manager Erik ten Hag has described Lisandro Martinez's apparent knee injury as a "personal disaster". Martinez's knee buckled under the weight of West Ham defender Vladimir Coufal in the 66th minute of United's 3-0 Premier League win at Old Trafford and he was forced off in the 71st minute. Ten Hag was unable to provide a specific prognosis on the injury but said it was "very bad" and Martinez was "very sad".

Despite big win for Manchester United, Erik Ten Hag gives fans bad news

"I can't say, it doesn't look good so there's a big concern, but we have to wait for the coming days what the diagnosis is then we can tell you more. "We do everything to get the right diagnosis to see what the damage is. He is very sad, very disappointed. We all feel really with him. First of all, it's a personal disaster when it's really bad. But let's wait for what it is. "But for the team, also it is really bad because he definitely brings us a lot."

Martinez returned from a four-month lay-off with a foot injury against Tottenham three weeks ago and he started in United's recent wins at Newport County and Wolves. The 26-year-old sustained a metatarsal injury in the Europa League quarter-final first leg draw with Sevilla in April that ended his first season at United early. He required a second round of surgery in September. Martinez's injury blemished one of the most comfortable afternoons of United's season as they won by a three-goal margin for the first time in a home league game since May.

Ten Hag is not getting carried away, though. "It's only one game, so don't celebrate this too much. We don't have reasons in this moment to do it but for today we are pleased with it. "But you need routines to get consistent performances. So you have to make decisions in a split second and when every time you have to swap your team, you have to swap your centre halves, swap your back four, positioning the right full-back to the left full-back and swap back again, and all those adjustments, all those rules and principles.

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"We have times in the season where every time we have to adapt to put an XI out and now in this moment, we don't have. But then the injury is coming from Licha Martinez so I hope we are not going back in such a process, we want to stay away from it. "We want to work on the team. And I know it's not about 11 players. It's about 15 or 16 players. I hope we can keep them all fit and I think then we can still achieve a lot in this season. In this Premier League, everyone is killing everyone and the process is going from final to final."