PORTLAND — A 53-year-old New Hampshire man has pleaded guilty to employing illegal immigrants at several Dunkin’ Donuts stores that he managed in Maine.

George Valvanis of Atkinson pleaded guilty Monday in U.S. District Court in Portland to one count of engaging in a pattern of recruiting or hiring illegal immigrants and one count of lying on an immigration document.

Federal prosecutors say between 2001 and 2009 Valvanis knowingly employed 18 illegal immigrants to work in several Portland-area Dunkin’ Donuts stores he managed.

He faces up to 5½ years in prison on the two charges. Sentencing is scheduled for April.