The 19-year-old was left on the bench for the derby clash with Huddersfield.
Leeds United went into their West Yorkshire derby with Huddersfield Town full of expectation.
They had won their previous three games in the Championship and beat Huddersfield at the John Smith's Stadium 3-0 earlier this season.
But they were outplayed at Elland Road today as The Terriers romped home to a 4-1 win victory.
Of course the result was probably not helped by the absence of Lewis Cook.
The talented teenager was left out of the team by Steve Evans, and his controlling presence was keenly felt in the heart of Leeds' midfield.
After the game Leeds United's head coach Evans spoke to BBC Radio West Yorkshire Sport, and revealed why he left Cook out of the starting XI:
"The boy Cook has played a horrendous amount of minutes for someone his age.
"He's played really committed and we thought late on against Blackburn he looked exhausted, in fact I think that was the word he said to me afterwards.
"It is our job to look at certain players and listen I thought Luke Murphy did well today."
Of course Cook is a young man, and Leeds are right to be cautious with him - but this is certainly a new development. They have played him back-to-back all season and the sceptics will no doubt point to the fact he is about to go on international duty with the England under-19s.
Leeds certainly missed Cook today and he was on the bench anyway, coming on in the 65th minuteof the game so surely he could have started.
Evans played his cards completely wrong for this game.