Matthews, a Toronto Maple Leafs center, will attend All-Star Weekend but not participate in on-ice events because he will be receiving "acute treatment for an ongoing wrist condition," the Maple Leafs said. He is day to day.
Matthews has participated in the All-Star Game three times in four NHL seasons. His 34 goals are tied for second in the NHL with Washington Capitals forward Alex Ovechkin behind Boston Bruins forward David Pastrnak's 37.
It will be the first All-Star Game for Tkachuk, an Ottawa Senators forward who is in his second NHL season. His brother, Calgary Flames forward Matthew Tkachuk, is on the Pacific Division roster.
Tkachuk is tied for fourth on the Senators with 27 points (15 goals, 12 assists) in 48 games.