Speaking to BT Sport, Jürgen Klopp said: "Yeah, unfortunately [it's an injury].
"It was shortly after training [on Monday], Trent went in a little bit earlier but it didn't look serious. We did further assessment and in the end it was serious. So, he is out for today for sure, he didn't travel with us.
"And it doesn't look great for the City game as well. It's a muscle thing. We thought he was just a bit tired from the [Brentford] game but it was more and now we have to deal with that."
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