"We're in trouble. We- 're in trouble, " Mourinho said.
Following the game, Uniter manager Jose Mourinho spoke about the injury, stating he wasn't optimistic about Zlatan's potential return this season. It also has two legs of a semifinal against Celta Vigo for a chance to play in the Europa League final.
Prior to kick-off at Turf Moor as the Red Devils recorded a 2-0 win over Burnley, every member of the squad showed support for the injured duo and Mourinho didn't want to give much away when quizzed about surgery for either.
"It is for the medical department to be more specific and they prefer to wait a couple more days because the players want to see specialists and have an extra opinion and we must respect that". Unfortunately they wont be the first or last players to get an important injury. Giving up is not an option.
Daley Blind took over from Rojo, but Mourinho has fewer options in central defence, with Chris Smalling and Phil Jones both now sidelined.
"If I was Smalling or Jones, I would play Thursday, with anything, I would", Mourinho added.
"So when you reach a certain level - and he has reached that level - then I don't think it makes sense".
Wayne Rooney could be thrown into action sooner than planned by ManchesterUnited to solve a growing injury crisis that has left manager Jose Mourinho to warn: "We're in trouble".