Alexander Isak was told to do something he has never done before by manager Arne Slot during Liverpool's Carabao Cup third round victory over Southampton.
The Reds won 2-1 at Anfield to progress to round four, with Isak scoring his first Liverpool goal since his British transfer record £125 million move from Newcastle.
Southampton equalised through ex-Manchester City academy graduate Shea Charles, before Hugo Ekitike struck with another late winner to seal Liverpool's progression.
The Frenchman's night ended in embarrassment, however, as he was shown a second yellow card for taking his shirt off during his celebrations.
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He had earlier replaced Isak at half-time, with the Sweden international still building up his match fitness after playing no part in Newcastle's pre-season or in their opening Premier League games as he attempted to force a move away from the club.
Liverpool fans inside Anfield noticed that, during the half-time interval, Isak was doing sprints with a member of Liverpool's medical team.
Such practice is common among players who have been taken off as a warm-down procedure, but more so with unused substitutes at the end of the match.
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Speaking to Sky Sports after the win, however, Isak surprisingly revealed that he had never been told to do sprints after being substituted before Tuesday night.
He explained: "Yeah, that was a new one! It was funny, it was a new experience. But I've got to get fit."
Team-mate Andy Robertson added: "He's not had much pre-season but since he's come in, he's been in fantastic shape.
"I thought he was excellent against Atletico, and I thought he was really good today.
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"He looks fit to me - obviously the sports scientists maybe think a little differently! But yeah, that's what we had to do in pre-season so he's maybe just playing catch-up to us."
Topics: Alexander Isak, Liverpool, Carabao Cup, Football
Ryan Smart