Kostas Tsimikas was once again given the James Milner treatment as the veteran midfielder was caught slapping his Liverpool team-mate during a 3-0 win at Norwich.
Liverpool appeared back to their free-flowing best and put on a brilliant display to sweep Norwich aside at Carrow Road.
But when Premier League debutant Tsimikas, in for the injured Andy Robertson at left back, gave the ball away on the edge of his own area, Milner was furious.
The chance eventually came to nothing, Norwich unable to capitalise, but Milner wanted to make sure the Greek defender knew exactly the kind of high standards expected at Liverpool.
Tsimikas is seen taking too long to pick out a pass and a high press sees him robbed of the ball before the eventual effort is sent high over Alisson's bar.
He appears disappointed with his lapse in concentration as he heads up the pitch but not before he has Milner ringing in his ears.
The 35-year-old races over, shouts at Tsimikas in a bid to liven him up before clipping him on the side of the head.
It is not the first time Milner has taken aim at Tsimikas, acting like an older brother to the Greek defender.
Tsimikas put in a decent performance against Stuttgart last summer in pre-season as he made his debut for Liverpool.
But nonetheless he was still on the end of Milner's foul-mouthed outburst when he failed to return the ball to the Reds' skipper.
Having received the ball on the left from the veteran midfielder, Tsimikas opted not to play the one-two with Milner, who made a darting run down the wing.
As Tsimikas played the ball safe to Takumi Minamino instead, an irritated Milner can be heard saying: 'Ah Kostas! F***ing hell.'
The Greek full-back joined the club in a £11.75million deal in August 2020 to provide competition for Robertson at left back.
Despite Milner's rather aggressive approach, Klopp was pleased with how Tsimikas fared on his Premier League debut.
'Very good, very good,' Klopp said of Tsimikas' display.
'I would say for at least 80 minutes very good, played good, was involved in all the offensive stuff, defended well. Then obviously someone pulled the plug a little bit!
'That's normal after that long period, so it was a really good debut.
'From the start in an away game, he played a really good game.'