"At 1-0 I brought on two wingers, when perhaps I could have settled for a 1-0 defeat," the Scotsman admitted after the 4-0 defeat.
"But we did not pass the ball well. I wanted to try out different systems and players.
"They should have been more positive, especially as there was no pressure on them results-wise, as we are safe from relegation.
"We did okay for an hour, but Chelsea are a quality side."