Chris Copeland started at small forward along with Carmelo Anthony and Tyson Chandler on the Knicks' front line. Raymond Felton played point guard and Iman Shumpert started at shooting guard. Inserting Copeland allowed Anthony to remain at power forward, where he's exploited mismatches all season.
The loss of Prigioni, though, is significant for the Knicks. The 36-year-old Argentine had started 16 of the Knicks' final 17 games and was a key cog during the Knicks' 13-game winning streak late in the regular season.
His relentless full-court pressure on opposing guards will be missed. It will be up to Felton to duplicate that pressure on Celtics ball handlers.
Prigioni sprained his right ankle toward the end of the first quarter in Wednesday's regular-season finale against the Atlanta Hawks.
The Knicks said X-rays on Prigioni's ankle came back negative. Coach Mike Woodson said on Saturday that Prigioni is progressing well.
"He's running around. If I had to play him today, I probably could play him but I'm just going to give him a few more days to make sure that he's ready," the coach said.
Woodson said he "feels good" about Prigioni's chances to play in Game 2.
Prigioni told ESPNNewYork.com on Friday that he is targeting a Game 2 return and he would "definitely" be back during the series.