Kazuhiro Sasaki, who returned to Japan to play for the Yokohama BayStars after a four-year stint with the Seattle Mariners, skipped his scheduled bullpen session on Sunday because of swelling in his right ankle.

Sasaki aggravated the twisted ankle in his first bullpen session at the BayStars' spring training site in Okinawa Prefecture on Friday.

Sasaki said he has no plans to go to the hospital.