United were held to a scoreless draw by the Spaniards on Tuesday, heaping further pressure on Portuguese manager Jose Mourinho. "You have to question the attitude of the players".
United already sit five points off the top four after seven games and have daunting trips to Chelsea and Manchester City to come in two of their next five Premier League games as well as two Champions League clashes with Juventus.
As for Martial, the Frenchman has failed to secure a regular position in Mourinho's starting XI and is also linked with an exit from the club.
"United have got to think very deeply how they are going to deal with this".
"Players who get upset with a manager, or coaching staff, and think "I'm not going to train properly because somebody upset me".
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"To me, it seems 50 per cent of that group of players are not really champing at the bit or enjoying their football".
"They should be doing it for themselves and the club, and if they like the manager and they do it for the manager as well that's an added bonus".
However, I wouldn't be surprised to see Alexis Sanchez axed on Saturday as his shocking form continues.
After the game, he liked a picture of himself which had the caption: "It's time for Mourinho to go".
The Ecuador global, who is into his 10th season at United, liked a post from a follower on social media which carried the caption: "I'm not even surprised about the outcome of this game".
However, a win may never be enough to turn the tide and the United squad are said to be furious that Mourinho has created a toxic atmosphere at the club with his persistent criticism.
Manchester United were supposed to be one of the main contenders for major trophies this season, after they ended up in second place and without any silverware in Mourinho's second campaign in charge last term.