The Celtics were awaiting a medical report yesterday to determine the condition of forward Jeff Green, who has not been practicing because of the results of a stress test.

“It is a concern, it’s a big concern,’’ said coach Doc Rivers. “Whenever anything is red-flagged and you have to re-do stuff, you get concerned. But we just have to wait and see.’’

Green viewed yesterday’s practice from the side of the court. Rivers said Green’s status could be determined by last night or today, after doctors evaluate further tests.

“My guess is results, and then doctors, because that’s usually what happens,’’ Rivers said.