"He's a different trainer than the one just before he went away on loan," Coppell told Reading's official website.
"Over the course of the season nobody comes in exactly the same every day, and there's a visible change in mentality since he came back. He's got the bit between his teeth."
Reading are currently a point above the relegation zone and face a trip to Wigan, a visit from Tottenham and a final-day journey to Derby as they bid to beat the drop. Coppell clearly believes Lita can help his side do that after confirming he would play a part against The Latics on Saturday.
"He will be involved this weekend, and I hope it's worked out for the best in the end. How you get there doesn't matter. If we get to where we want by May 11, nobody will worry how we got there," said Coppell.
"I'd have been equally as happy for Leroy to have stayed here and had the mentality shift, but at the time he couldn't see himself getting a game.
"We've not flogged the players in training this week, you can't at this time of the year, but you can see the indications with him."