(Reuters) - Boston Red Sox All-Star center fielder Jacoby Ellsbury has been placed on the 15-day disabled list after he dislocated his right shoulder, the team said on Saturday.

He could miss up to eight weeks, Major League Baseball's website said.

A Red Sox statement said team officials were in the process of determining a treatment plan.

Boston manager Bobby Valentine told reporters he had not heard the word "surgery" mentioned in the team's discussions of Ellsbury.

Dislocations, when the upper arm comes partially out of the shoulder socket, can typically take six to eight weeks to heal, mlb.com said.

Ellsbury, runner-up for American League Most Valuable Player last year, was injured in a collision with the Tampa Bay Rays' Reid Brignac at second base on Friday.

Brignac landed on Ellsbury's shoulder and the Red Sox player, after being helped up by trainers, held his right arm close to his body as he walked off the field.

(Reporting by Gene Cherry in Salvo, North Carolina, editing by Pritha Sarkar)