DiPietro backed up Al Montoya in the Islanders' first two games this season.
DiPietro, whose laundry list of injuries seems as long as his 15-year contract, will be re-evaluated Thursday. Coach Jack Capuano said doctors have not ruled out a concussion.
"He took one high and hard there and it shook him up a little bit," Capuano said. "He looked all right."
DiPietro has a history of concussions in his injury-plagued career, and was being evaluated Thursday to see if he had another. The 30-year-old netminder has played a total of 39 games in the past three seasons.
He missed the majority of the 2008-09 and 2009-10 seasons because of a knee injury and has also had surgery on both hips since being chosen No. 1 overall by the Islanders in the 2000 draft.
Last season, DiPietro was sidelined for several weeks because of broken bones in his face caused by a punch from Pittsburgh goalie Brent Johnson on Feb. 2. DiPietro was felled by a left hook above his right eye, and the broken bones and swelling in his knee kept him out of action until March 19. He played in five games after returning.
DiPietro played in a total of 13 games in the two previous seasons because of his troublesome knee. He has never played more than 63 games in a season.
Montoya made his third straight start after winning the top job out of training camp. Backing up Montoya was Russian goaltender Evgeni Nabokov.
Nabokov, 36, had not appeared in a regular season game for the Islanders since famously spurning the team in January, when it claimed him off waivers from Detroit.
Nabokov refused to report and was subsequently suspended by the Islanders, who later tolled his contract to retain his rights for the 2011-12 season.
Nabokov decided to attend training camp this season, and made the team's opening night roster as the third goaltender on the depth chart.
Katie Strang covers the NHL for ESPNNewYork.com. Information from The Associated Press was used in this report.