LISANDRO MARTINEZ was spotted with his foot in bandages after playing against Wolves.
The Manchester United defender appeared to injure his left foot during the 4-3 win over Molineux.
After being withdrawn by Erik ten Hag, he was spotted receiving treatment in the away duo.
Eagle-eyed fans spotted a member of United's medical team bandaging Martinez's left foot.
The potential injury is a concern following his recent return to action.
Martinez had been sidelined since September with a foot injury before returning against Tottenham two games ago.
His injury problems have limited the World Cup winner to just nine appearances so far this season.
The Red Devils are already without fellow defenders Tyrell Malacia and Victor Lindelof, who are stepping up their comeback on the training field.
Meanwhile, Anthony Martial, Mason Mount and Aaron Wan-Bissaka also remain sidelined.
In response to Martinez's potential backlash on social media, one fan wrote: “This doesn't look good.”
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Another supporter simply responded with a crying emoji.
Martinez's return was highlighted as a potential turning point for United's season under Erik ten Hag.
Supporters praised his dominant performance in the recent draw against Tottenham, his first appearance since returning from injury.
Since joining Ajax last summer, the 26-year-old has made 53 appearances for United, scoring once.