Liverpool's Brazilian goalkeeper Alisson Becker was injured and substituted during the first half of the Premier League season opener against promoted Norwich City on Friday.
With Liverpool 3-0 ahead in the 36th minute at Anfield, Becker slipped as he was playing the ball out and went down, holding his calf, calling for medical attention.
A stretcher was brought out for the keeper but he was able to leave the field with the help of support staff.
Spanish goalkeeper Adrian, who signed for Liverpool on a free transfer on Monday, came on to make his debut.
