Auston Matthews is expected to miss at least four weeks with a shoulder injury, the Toronto Maple Leafs announced Monday.
The 21-year-old centre scored 10 goals in the first six games of the season before going without a goal in his last five.
Matthews recorded at least two points in each of his first seven games of the campaign, matching an NHL record shared by Mario Lemieux, Wayne Gretzky, Mike Bossy and Kevin Stevens.
Toronto (8-3-0) leads the Atlantic Division and is deep at the centre position with high-scoring John Tavares (13 points in 11 games) and Nazem Kadri, a strong two-way player.
The Leafs also have productive wingers in Mitch Marner (15 points) and Kasperi Kapanen (10 points) and can add another talented forward by signing restricted free agent William Nylander, who has yet to play this season. The team and Nylander, who had 20 goals and 61 points last season, have been unable to agree on a new contract.