Liverpool boss Jurgen Klopp admits he is worried about the fitness of captain Jordan Henderson.

The club captain was withdrawn after 71 minutes in their 2-1 win over Newcastle United on Wednesday.

Henderson, who made a mistake that led to Newcastle's opener in the game, has not been in the best of form so far this season.

He had to come off due to a fitness concern.

Asked if his team would be signing a midfielder before the transfer window closes, Klopp replied to reporters: "I don't think so, but as long as there is time we should not close the door completely."

He added on Henderson: "Obviously Hendo is injured, he got a hamstring [injury], which is absolutely not helpful.

"I don't think so."

He added: "[It was] that serious that he couldn't carry on, so it was no tactical change."