The Leeds head coach has been discussing the 26-year-old midfielder after a 4-1 defeat to Huddersfield.
United lost 4-1 at home to their local rivals and Evans admits he shouldn't have taken Murphy off.
The midfielder kept possession well, according to the Leeds boss.
The Scot told the BBC on Saturday: "I thought Murphy did well today. I thought he kept the ball. He was one of the better players in the first half. But we were wary of his legs, although we got our substitutions wrong today."
Murphy has struggled for game time this season and some may feel Leeds need a new midfielder as back-up for the likes of Lewis Cook and Alex Mowatt.
But Evans clearly feels the 26-year-old did a job for him on Saturday and was candid when discussing his substitutions.
He admits things were evenly poised at 1-1 and that his changes affected the game for the worst.
Leeds will obviously need much better against Rotherham United next weekend, although Neil Warnock has the Millers on a strong run of form as they bid to beat the drop.