Leeds United beat Rotherham United 2-0 in the FA Cup.
Murphy had started the fixture slowly, and failed to get to grips with the match in the early stages.
However, the former Crewe Alexandra man looked bright as the match went on, and Evans believes Murphy's improvement was sparked by some tactical advice he gave the 26-year-old.
"Murphy couldn’t hear me when I was saying don’t walk on to a player, stand off him [so he came over to the bench]," Evans said.
"It was very good how Murphy then became a good player, from being ineffective earlier in the game. And it was only a matter of standing off players, rather than going to mark them."
Murphy is fighting for his place in Leeds’ starting line up, with Evans having a wealth of options in central midfield.
Following the extension of Liam Bridcutt’s loan, Leeds now have a wealth of options in the middle of the pitch.
The likes of Bridcutt, Lewis Cook and Tom Adeyemi all seem to be ahead of Murphy in the pecking order at the moment.
Murphy, however, will feel that he showed his quality in Leeds’ win over Rotherham.
The Whites scored through Mustapha Carayol and Souleymane Doukara to secure their progress into the fourth round of the FA Cup.