Louis van Gaal faces the prospect of only having two fit specialist strikers for Manchester United's crucial Premier League clash with Liverpool on Sunday as James Wilson could be a doubt.

Wilson, 19, scored before being substituted off with a hamstring problem as United's under-21 team beat their Everton counterparts 2-1 on Monday.

United are already certain to be without Robin van Persie for the trip to Anfield, with the Netherlands international set to miss a fifth consecutive game with an ankle injury.

If Wilson is ruled out, it would leave only Radamel Falcao -- who has scored just four goals in 21 appearances for United -- as backup for current first-choice striker Wayne Rooney. Van Gaal, however, has also showed a willingness to use midfielders Angel Di Maria and Marouane Fellaini in attack.

Di Maria will be available again for the meeting with fifth-placed Liverpool after suspension, although centre-back Jonny Evans will serve the third game of a six-match ban.

Wilson has not featured for United since coming off the bench in the 3-1 win over Burnley on Feb. 11, and has only scored two first-team goals this season.

Falcao had played in the previous match for United's U21 team against Tottenham, but was not involved against Everton.

Paddy McNair scored the other goal for Warren Joyce's side on Monday, with Adnan Januzaj and Andreas Pereira also featuring, although Victor Valdes was absent.

Former United player Teddy Sheringham, meanwhile, has said Wilson should be given a chance to play alongside Rooney on a regular basis by Van Gaal.

James Wilson is a doubt for Manchester United with a hamstring problem. Matthew Peters/Man Utd via Getty Images

"I really like James Wilson," Sheringham, now a coach at West Ham, told United's official website. "It's a shame for him that Radamel Falcao and Robin van Persie are in front of him.

"Louis van Gaal said recently that he doesn't have a striker who can score 20 goals a season, but I think if you put Wilson up there with Wayne Rooney then you'd have two players who can reach those figures for you.

"He's very direct, scores goals, has good pace and that added bonus of being a left-footer -- they always tend to catch defenders off guard and it always looks more special when the left-footed strike goes in.

"I like his attitude. He looks a good player, a good prospect and one that everyone needs to keep an eye on."