Alfredo Morelos did not share in his joy. The Colombia international chucked his gloves to the floor in frustration after being replaced by Jermain Defoe midway through the second half as Rangers moved 11 points clear at the Premiership summit.
Ryan Kent, Kemar Roofe, Scott Arfield and a James Tavernier were all on target ahead as Gerrard's side made it look easy. Morelos was taken off with Thursday's Europa League clash against Benfica in mind.
But he did not look happy to be substituted. "Does he ever?" Gerrard said. "I can't work it out. We're 4-0 up, he's played well, his team-mate is about to come on, we've got a big game on Thursday. "I don't know, you'll have to ask Alfredo why he was a bit sad.
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