Tavares suffered an oblique strain while training for the IIHF World Championship in Slovakia and will be sidelined for approximately four weeks, Elliotte Friedman of Sportsnet reports.
Tavares suffered an oblique injury during Team Canada's practice Thursday and will return to Toronto for further evaluation by the Maple Leafs medical staff.
Tavares suffered an upper-body injury during Team Canada's practice Thursday, Darren Dreger of TSN reports.
Tavares won 63 percent of his faceoffs Monday and had a power-play assist in a 3-2 win over Boston.
Tavares drew an assist and also scored an empty-net goal in Thursday's 4-1 win over the Bruins in Game 1 of the best-of-seven series.
Tavares scored a goal and an assist in Wednesday's 4-2 win over the Sabres.
Tavares scored a goal and added an assist in Saturday's 6-2 loss to Ottawa.
Tavares scored a goal and added two assists in a 3-2 win over Edmonton on Saturday.
Tavares scored his 37th goal of the season and added two assists in Saturday's 5-2 win over the Sabres.
Tavares was held without a point Thursday in his first return to Long Island as a member of the Maple Leafs.