RUBEN AMORIM warned his Manchester United stars that their Europa League final places are on the line. United, a lowly 16th in the Prem and on a dismal run of TWO points from their last seven games, visit Chelsea on Friday night. But the Portuguese boss will NOT accept players downing tools — and says he has not yet picked his team for Wednesday’s final against Tottenham. Asked if players still have a chance to make the starting XI for Bilbao, Amorim said: “That is clear. "I know the starting XI I am thinking for Chelsea — then I will see. “Even the way we play against Chelsea I will see it — and it will be important for the next one. “We have to try to recover. The best thing to prepare for the final is to play the game and then the players have to understand if you play or don’t play against Chelsea, it means nothing to the final. “That is important. I am just preparing [for] the game of Chelsea. That’s my focus.” Amorim is unlikely to risk defensive duo Leny Yoro and Matthijs de Ligt for the trip to Stamford Bridge. And their injury-hit campaigns have left the manager wondering if he needs to look for a new centre-back this summer. JOIN SUN VEGAS: GET £50 BONUS A striker, a No .10 and a central midfielder are currently the main priorities this summer. But Yoro, signed from Lille last summer for an initial £42million, has started only 12 games in his debut season, while De Ligt, who joined from Bayern Munich for £38.5m, has spent the last few weeks on the treatment table. Amorim said: “Leny was the same as Matthijs. “I was thinking about next year, the squad if we need another guy, if it is a long injury. “That is my concern. It is not just about the final. Of course, I want every player fit. “But Leny had that problem in his foot and I was so concerned about the next season, the next squad, the way we build up the squad. "That was my biggest concern.” Amorim says he will not take any risks with players who have had injury worries in recent weeks. He said: “If there is a player that has not recovered for the game and it would put him at risk for the final, he will not play.”