Manager Jose Mourinho admitted Manchester United are in "trouble" following serious knee injuries to inform striker Zlatan Ibrahimovic and defender Marcos Rojo amid a growing injury crisis at Old Trafford.
Both are feared to have suffered season-ending knee injuries in Thursday's UEFA Europa League quarter-final victory against Anderlecht.
The pair join a long list of casualties at the English Premier League club, with defenders Chris Smalling, Phil Jones and playmaker Juan Mata already on the sidelines.
And boss Mourinho is genuinely worried as Red Devil try to qualify for next season's UEFA Champions League via a top-four finish in the English Premier League or by winning the Europa League, where they will meet Spanish team Celta Vigo in the semi-finals.
"We are in trouble," Mourinho said ahead of Sunday's trip to Burnley. "We are in trouble.
"In this moment, Eric Bailly played six matches in a row, and we lost Marcos Rojo, we don't have Jones or Smalling, we are in trouble and now we lose Zlatan too.
"But in attack, we have options and [Wayne] Rooney is coming, and let's see if Mata can also return before the end of the season, let's see what happens."