Knicks fans should cherish Jason Kidd’s role on the team.

They may not see him when this season ends.

Kidd, who turned 40 yesterday, said Friday night he may not play out his entire three-year contract with the team.

“We’re going to revisit [it],” he said. “We [would] love to make it to 42, but we have to be realistic. If the body and mind can’t compete at the same time, then I got to move to the side and watch these younger guys play. But I feel great.”

Before Saturday night’s 110-84 rout of the Raptors, rookie Chris Copeland led the Garden crowd in singing happy birthday to Kidd, who is in his 19th season in the league and with his fourth team. He received a loud ovation after entering the game midway through the first quarter.

“It was nice that the organization did that,” said Kidd, who was held to three points, three rebounds and two assists in 23 minutes.

The Knicks hope to have the grizzled guard around past this season. Coach Mike Woodson, who has moved Kidd into a reserve role to limit his minutes, thinks he can play two more seasons.