© PA Images / Ian West/PA Wire
The Beady Eye frontman is said to have been told off by officers during the Manchester City vs Real Madrid game at the Bernabeu Stadium.
Gallagher's arm was allegedly grabbed by police after City went 2-1 up and he had become "vocal", reports The Sun.
Real Madrid went on to win the game 3-2 after a last-minute goal by Cristiano Ronaldo.
A source said: "Liam got ticked off. He was so hacked off when Madrid got back in the game he left with pals before the end."
His spokesman added: "They left without escort."
Liam Gallagher recently labelled comedian Russell Brand a "d**k".
