Arsenal star Kieran Tierney was walking out of the shower when he suffered an injury that kept him out for many months.
The left-back had to go through with surgery on his knee cartilage near the end of last season.
The Scotland international suffered the issue in February, before his knee gave way a few weeks later in training.
"The Wolves game, he had a hyper-extension injury, finished the game, didn't mention it and then played the next five games with no problems whatsoever," Arsenal doctor Gary O'Driscoll revealed in an episode of All Or Nothing.
"But he then walked out of the shower on Thursday after training, turned a corner, bent his knee and felt the knee collapse."
Tierney is fit for the Gunners this season, but has started both Premier League games on the bench so far.
