Real Madrid winger Gareth Bale is battling for fitness ahead of Wednesday's Champions League match at Liverpool after the club announced he is suffering from a buttock muscle injury.
The 25-year-old Wales star was an unused substitute in Saturday's Primera Division win over Levante on his return from international duty, while reports in Spain said he also sat out training on Monday.
That raised doubts over Bale's availability for the trip to Anfield, as well as this weekend's El Clasico with Barcelona, although Madrid have said for now they will keep an eye on the player.
Phil Jones is determined to make sure Manchester United's absence from the Champions League is just one season long.
United crashed out of Europe's premier club competition - beaten 3-1 by holders Bayern Munich, with the quarter-final tie lost 4-2 on aggregate.
As David Moyes' men sit seven points adrift of fourth place in the Barclays Premier League with five matches left, it would take a minor miracle for the team to qualify for the competition next season.
That means United will miss out on playing in the tournament for the first time in 19 years.
"It's hugely important we get back in it as soon as possible," the United defender said.
"Manchester United need to be in the Champions League.
"Nights like these do not come around too often. They are the ones you look back on and think - 'what a time that was'.
"You want to play against the best and you want to test yourself against the best.
"We believe it will be. We are confident we be right up there challenging next season.
"This wasn't the way we wanted it to end. I thought we more than held our own against them tonight.
"We didn't disgrace ourselves against a really good team but we are still disappointed."
Manchester United's Champions League dream is over after a resounding defeat away to Bayern Munich.
It was a tough night for Manchester United in Munich. They're out of the Champions League - beaten by Bayern Munich 3-1. Patrice Evra put them in the lead for just 73 seconds.
Manager David Moyes - already under pressure for disappointing results at home will have to head back to face the music.
Manchester United fans are in Munich, ahead of their Champions League second-leg clash with Bayern Munich.
Manchester United boss David Moyes says he is looking forward to facing Bayern in the Champions League.
David Moyes calls for improved #mufc performance: "I expect us to play better. And I believe we can. To get through, we will have to."
Our correspondent David Chisnall has joined the Manchester United team and supporters on the trip to Munich.
He has been taking a look around the impressive venue for tomorrow's match.