Souness plays down Yorke bust-up
Yorke reacted angrily to being replaced by Andy Cole after 63 minutes gesturing towards his manager as he walked off.
"He just wasn't happy being taken off, which is what I want my players to be," said Souness.
"The gist of it was he didn't think he should have been the one to come off. I want that from my players."
A late burst of goals from Newcastle gave them the resounding win, but Souness felt the scoreline flattered the home side.
"That's what it will say in the papers tomorrow, but I don't think it was a 5-1," added Souness.
"I thought for 75 minutes, we gave them a game. In the last 15 minutes, we had too many people who didn't do their jobs.
"Obviously Newcastle will look at their goals and take the positives out of the game, but there were some goals they scored today that any decent defender would have stopped.
"We weren't at the races. The fourth goal, Kieron Dyer going through Craig Short in a 50-50 block tackle, I've never seen that happen before."