Altidore had been in New York to get a second opinion on the chronic foot issue, then underwent the procedure following his evaluation.
It's another setback for Altidore, who was reintegrating himself into the team after Toronto's coaching change saw the departed Chris Armas replaced by assistant Javier Perez. Altidore was away from the team and training by himself for a period after a disagreement with Armas over a substitution, but returned to the club after the coaching change. The 31-year-old forward has appeared in 10 games this season, making five starts and scoring two goals across 489 minutes.
Priso featured in 11 games this season, scoring one goal and logging two assists.