Manchester United duo Marcus Rashford and Antony Martial missed training on Monday afternoon ahead of Tuesday's pivotal Champions League clash with Bayern Munich at Old Trafford.
Both attackers have emerged as doubts as they were unavailable to link up with the rest of the first-team squad at Carrington due to illness.
Rashford was absent from first-team training on Friday due to illness, but he was named on the substitutes' bench for last Saturday's humbling 3-0 defeat at home to Bournemouth in the Premier League before coming on for the final 11 minutes plus stoppage time.
Martial, meanwhile, was handed a start ahead of Rasmus Hojlund up front, but the Frenchman was unable to make the desired impact in the final third and was replaced just before the hour mark.
There was some positive news from Carrington, though, as Lisandro Martinez was spotted training with the main group, although the defender primarily focused on individual exercises as he continued his rehabilitation from a foot injury.
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Martinez underwent a second foot operation in early October and he is not expected to return to first-team action until the New Year, but his return to training is at least a positive sign for the Red Devils.
In addition, Victor Lindelof was present in training after manager Erik ten Hag expressed doubts over the Swede's fitness at his pre-match press conference on Monday.
"It's a condensed programme so we have a training [session later], so at this moment, I'm not sure about everyone, who's available for tomorrow," Ten Hag told reporters.
"But the question mark is on Victor Lindelof, whether he can make it or not. We have to wait and see until tomorrow."
Lindelof was forced to miss last weekend's loss to Bournemouth due to an unspecified injury, but the defender could be in a position to return to the matchday squad for the clash with Bayern.
Amad Diallo was also involved in first-team training having recently recovered from a long-term knee injury, but the winger is ineligible to play for Man United on Tuesday as he was not selected in the club's Champions League squad.
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Man United enter Tuesday's crunch match with Bayern needing to beat the Bundesliga giants as well as hope that Copenhagen and Galatasaray draw in the other Group A fixture to ensure that they secure a top-two finish and qualify for the last 16.
"I never think in negative scenarios. I only think positive," Ten Hag said at his press conference. "We know what we have to do, we have to win to stay in Europe, so it's all about that.
"So I will prepare the team with that feeling, with that belief that we can do it. I think we have shown in the last weeks, when we are at our best, we can do it."
Asked what gives him belief of claiming a positive result against Bayern, Ten Hag said: "The game against Chelsea, the game against Everton and even the game against Galatasaray. And so I know this team can perform at really high levels. We did it three months ago. We did it last week. And so, I know we can do it.
"When we have the right mood, we have the right spirit and it starts with the right attitude, when everyone is ready for it, we are able to do it."
Man United, who have already lost six games at Old Trafford in all competitions this season, suffered a 4-3 defeat away against Bayern in the reverse fixture in September.
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