Mike Woodson didn't have an update on Lin, who had surgery to repair a partially torn meniscus on April 2.
He said the second-year point guard would be re-evaluated when the team returns to New York. Lin has yet to take contact or scrimmage. He has been sidelined with the knee injury since March 24.
"He's got to cut and guard people and push and do things of that nature, that's the big test," Woodson said.
Lin played one-on-one on Saturday, cutting and moving laterally for the first time since his surgery.
A day later, he said he'd re-evaluate his injury later in the week. If everything went smoothly, he hoped to return sometime during the Heat-Knicks series, possibly as early as Sunday's Game 4.
"I think I'm gonna evaluate it at the end of the week and see," Lin said after the Knicks' practice on Sunday. "Hopefully I'll feel good by then ... the main thing is to be able to play without thinking about (the injury)."
Lin has already ruled himself out for Games 2 and 3.
A big hurdle for Lin is taking contact. He hopes to do that for the first time this week.
Ian Begley is a regular contributor for ESPNNewYork.com.