If anyone knows what Derek Fisher is going through as he struggles to find his game, it’s probably Patrick Ewing.

Ewing also was president of the Players Association the last time the NBA locked out its players and then played a shortened season. The Knick legend could still shoot and rebound, but he believes his Achilles problems in the 1999 season directly resulted from his role as a negotiator and his inability to adhere to a normal offseason training program.

“I almost expect Derek to have a tough time, with all the negotiating he had to be a part of,’’ Ewing told the Daily News recently. “Too much negotiating and not enough work on the court — that’s what happened to me during the lockout. Too much talking and not enough training. I couldn’t put in my usual offseason work routine.”