Liverpool manager Jurgen Klopp confirmed goalkeeper Adrian was injured by a pitch invader at the end of the team's UEFA Super Cup win.
Klopp originally stated Adrian was a doubt for Saturday's clash with Southampton in the Premier League. However, Adrian said he is "very optimistic" about playing, according to Glenn Price of the club's website:
"It was a strange, weird situation because we were celebrating between us and one guy jumped from the crowd and started running.
"I think he slipped in front of us and also the security with him and made me a tackle from the side.