Lowry remains hopeful he can participate in USA Basketball's training camp in August and play for the national team in the FIBA World Cup in China in September, sources told ESPN.
The thumb injury on his non-shooting hand hampered Lowry throughout the Raptors' championship run, although he averaged an impactful 16.2 points, 7.2 assists and 4.0 rebounds against the Golden State Warriors in the NBA Finals.
"During the game, I can't feel my thumb," Lowry told ESPN's The Jump during the Finals, "... the flicking of the passing, the kind of -- the ball movement, handling the ball."
Lowry, 33, injured his thumb in the Eastern Conference semifinals against the Philadelphia 76ers.
In Toronto's title-clinching Game 6 victory over the Warriors, Lowry had 26 points on 9-of-16 shooting with 10 assists, seven rebounds and three steals.