Liverpool boss Jurgen Klopp admits Alex Oxlade-Chamberlain has aggravated knock in their friendly with Sporting CP.

The England international set up Liverpool's second goal in the 2-2 draw with Sporting at Yankee Stadium that concluded their three-game tour of the United States.

Klopp said: "Two games in a row with 60 minutes. That is very important. He has been a bit unlucky with a calf problem. It is not a tear but something he has from time to time when the intensity gets too high for him.

"He had to get through the first 20 minutes when he was really involved and then he felt it. Then he was not part of the game anymore, which is not too cool for the others if there is someone on and off.

"Apart from that he has made all the sessions, which is unbelievably important. That is very positive.

"Every year is the same in pre-season. You have these games which have no real value at the end. It is different to the Premier League. Some things I liked, some things I did not like."