The loss of Matthews is a devastating blow for the Blazers' hopes of challenging for a Western Conference title, as well as a significant personal hurdle for Matthews. He's set to become a free agent this summer and expected to command a significant deal.
Torn Achilles tendons typically require eight to nine months of rehabilitation.
Matthews was injured in the third quarter of Thursday night's victory over Dallas in the Moda Center. Matthews crumpled to the floor upon making a move to the basket. He had a streak of 250 consecutive games played end on Dec. 10, 2012, only to start a second streak of 142 games that will end now.
In the best season of his career, Matthews was averaging 16 points and making nearly 40 percent of his 3-pointers. He is one of the NBA's best 3-point shooters.
The Blazers' trade deadline deal for Arron Afflalo will give them an experienced shooting guard to move into the starting lineup. C.J. McCollum will likely play a more significant role off Portland's bench.
Portland is 41-19, holding onto the third spot in the Western Conference playoff race. The Blazers have won five straight.