Fraser played in two regular-season games for Boston in 2013-14.
The 24-year-old forward also scored the winning goal in overtime of Game 4 during the Bruins’ second-round playoff series against the Montreal Canadiens.
Chiarelli also said veteran winger Ville Leino has been invited to training camp — which begins Sept. 18. — on a tryout basis. The team reportedly has invited veteran winger Simon Gagne for a training camp tryout, too.