If the manager decides it's time to change the team then this is the signal you'll see on the touchline. The arms go up in the air and holding on to both sides of the flag, it is hung above the head ...

Keith Hackett slammed the referee as Dynamo Zagreb got away without punishment for a "kick" on the Arsenal star.

"Despite this defensive manoeuvre, Portsmouth's No 30 remains onside at the moment the ball is played and the assistant referee rightly keeps his flag down." Foy says: "The referee does very well ...