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. It was a bit of a strange situation but I feel much better today and I hope [I'm] ready for tomorrow."
The Reds beat Chelsea 5-4 in a penalty shootout on Wednesday after a 2-2 draw in normal time, and Adrian's save from Tammy Abraham clinched the trophy for the Reds.
Per Paul Gorst of the Liverpool Echo, Klopp was unhappy with the supporter who left the Reds goalkeeper with a knock:
With first-choice stopper Alisson Becker also sidelined with an injury, it means the Reds may be down to their third-choice option between the sticks at St Mary's: veteran Andy Lonergan.
Per Dominic King of the Daily Mail, the Liverpool manager has confirmed the 35-year-old is preparing to be involved in the game:
For Liverpool, the injury to Adrian comes at a bad time, given he would have taken confidence from his big moment on Wednesday.
Adrian came up big when his team needed him in the shootout, and he would have been desperate to make an impression before Alisson returns.
Lonergan would represent an experienced alternative, having been a consistent goalkeeper in the Football League for many years, enjoying spells with Preston North End, Leeds United and Bolton Wanderers. However, he spent the previous season on loan at Rochdale, making just seven appearances.
Klopp had further disappointing team news for Reds supporters, with Naby Keita not fit to feature after suffering an injury ahead of the Super Cup:
Given their midweek exploits, it would be no shock if Liverpool were feeling jaded before the match with Southampton.
The Reds were a little short of their best against Chelsea, with the Blues able to get at their defence multiple times. That will be a concern for Klopp, especially after Norwich City were able to get in behind on a number of occasions at Anfield in the first game of the Premier League season, despite an eventual 4-1 win for the home side.
Klopp said he's not too worried by the defensive issues:
Saturday will see Southampton play their first home game of the season, and there is likely to be a lively backdrop to the game as such.
Fortunately for Liverpool, Saints don't appear to be in the best form, as they were hammered 3-0 by Burnley in their opener. When the two sides met on the south coast last term, the Reds came from behind to secure a 3-1 win.