Svatos, who leads the team with 32 goals, was injured during last weekend's 5-3 loss at Dallas. The Avalanche announced Thursday that he will need several months to recover.
"Marek sustained a fracture in his right shoulder, which was discovered during an MRI. The subsequent result is that he will require surgery," trainer Matt Sokolowski said. "It's important to note that this injury is to the right shoulder while both of his previous shoulder injuries were to his left shoulder."
Svatos currently ranks second among NHL rookies in goals and third in points (50).
His nine game-winning goals led the NHL and tied the league record for rookies.
Also Thursday, the Avalanche acquired forward Jim Dowd from the Chicago Blackhawks and also recalled goaltender Vitaly Kolesnik from AHL Lowell, a day after trading starter David Aebischer to Montreal.
The Avs sent Chicago their fourth-round draft choice this year for Dowd, a 14-year veteran who needed only to switch locker rooms for Thursday night's game in Chicago.
Kolesnik appeared in seven games for Colorado in December after his first recall from Lowell on Dec. 6. He went 3-3 with a 3.29 goals-against average and an .886 save percentage.
Kolesnik has appeared in 29 games at Lowell this season, compiling a 15-13 record. He is tied for second in the AHL with three shutouts and ranks sixth in save percentage (.918) and 13th in GAA (2.80).
Kolesnik played for Kazakhstan in the Torino Olympics, where he lost both of his starts.