Clarke inspired an improved performance from his team in the second half after giving his side a rollicking at the break, and he also made a key impact on the game by bringing on Lukaku for Shane Long on the hour.
"We are pleased with Romelu," Clarke said. "It's great that you can look to your bench and see people who can change a game and Romelu is one of them. He did a good job for me, but so did Shane Long. He had the hardest part of the game."