It was Tuesday morning on the ice at Wells Fargo Center, and Brad Richards sidled up on one knee next to Dan Carcillo.

Unbeknownst to those watching, Richards was aware the tough-guy forward was about to play his first game of the postseason, as Game 3 of the Rangers’ first-round series against the Flyers was hours away. The conversation wasn’t too complex, Richards telling Carcillo to keep things simple, to keep things straight ahead.

“I’ll be honest, from what I heard coming in, one of the most different guys from all the stories I heard,” Richards told The Post after Thursday’s practice, referring to Carcillo’s history of 10 different fines or suspensions over his eight-year career. “I don’t know if he changed or it was overblown, but when he came in, he was real quiet, very professional.

“He’s in the gym every day, takes care of body, practices hard, works hard. So from what I heard — and that was a long time ago — he was a lot different. Professionalism and all that.”

Following Richards’ talk, Carcillo went out and had a terrific game, being a physical force, a loose-cannon agitator, and the man who scored the final goal that gave the Rangers a 4-1 win. It also gave the Blueshirts a 2-1 edge in this best-of-seven first-round playoff series heading into Friday night’s Game 4 in Philadelphia, a game for which Carcillo has seemingly made himself indispensable.