Red Sox put Ortiz back on disabled list

BOSTON -- The Red Sox on Monday put ailing designated hitter David Ortiz back on the disabled list with a right Achilles strain, but have yet to close the door on a potential return later this season.

Ortiz will receive an injection in the area, according to manager Bobby Valentine. The team will determine from there whether the 36-year-old slugger will be able to return at all this season.

Outfielder Ryan Kalish was activated to take his roster spot.

Ortiz missed 35 games after he was placed on the DL on July 17 with the injury. The Red Sox went 13-22 during his absence. He was activated on Friday and went 2 for 4, including a double and two RBIs, but was sore after the double and did not play Saturday night or Sunday.

Before his injury, Ortiz was having his best season in years, hitting .318 with 23 home runs, 60 RBIs and a 1.026 OPS.

The Red Sox on Monday also activated right-hander Daisuke Matsuzaka to start the series finale against the Kansas City Royals, sending reliever Pedro Beato to Triple-A Pawtucket.