Lothar Matthaus appeared to take a swipe at Luis Diaz after the Colombian joined Bayern Munich from Liverpool.
Diaz made 50 appearances for the Reds in all competitions last season as Arne Slot led the club to Premier League glory in his first season in charge.
He is thought to have first told Liverpool bosses of his desire to leave last summer, but the club held firm.
They later made two separate attempts to agree a contract extension with the left-winger, but failed to convince Diaz due to a gap between offers and demands.