Liverpool veteran James Milner rapped Kostas Tsimikas during victory at Norwich City.
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.
He raced over, shouted at Tsimikas in a bid to liven him up before clipping him on the side of the head.