The United and England legend was spotted in the stands at Old Trafford during his former club’s 3-0 loss and looked distinctly unimpressed with their performance.
Rooney, 38, has been in good spirits in recent weeks after steering Plymouth Argyle to two wins from their last four Championship games, boosting their survival bid.
However, his condition just three years after retiring has left supporters worried.
A photo of Rooney watching United while clad in a black coat was shared by Sky Sports on X and several users were quick to urge him to take care of himself.
‘He looks really bad’, one account posted in response.
‘Hang in there, Wayne,’ another said, perhaps in a tongue-in-cheek fashion.
‘Rooney looks older than his age,’ a third added. ‘He needs to take care of himself.’
A fourth account wrote ‘He looks too old’, accompanied by a crying emoji.
‘Is he suffocating, he’s all red?’ a fifth asked. ‘Asking out of concern.’
Rooney confessed in 2022 that he only had one suit that still fit him after being ribbed over his appearance by Jamie Carragher on Sky’s Monday Night Football.
Carragher noticed Rooney was wearing the same suit, shirt and tie combination from his Premier League Hall of Fame induction a fortnight before the show.