Islanders coach Jack Capuano said the injury wasn't serious. New York called up 27-year-old goalie Nathan Lawson from Bridgeport of the AHL on Saturday and gave him his first NHL start that night. He made 35 saves, but the Isles lost 4-3 in a shootout. Veteran netminder Dwayne Roloson served as his backup.
DiPietro skated Saturday morning with the team and said the injury to his surgically repaired knee was minor.
Lawson was 2-4-2 in nine games with Bridgeport this season.
Information from The Associated Press contributed to this report.