DUNEDIN, Fla. (AP) _ For David Wells, his trade to Toronto is proving to be a pain in the back.

The colorful left-hander was in the treatment room instead of on the field Tuesday, bothered by back spasms.

``Wells has some lower right back inflammation,'' Toronto trainer Tommy Craig said. ``We're treating him now, and he seems to be responding to the treatment and exercises. We don't anticipate it being a long and drawn-out thing. We're just going to take it day to day right now, then ease him back up to the on-the-field stuff.''

Wells felt discomfort his first time Saturday but finished his 11-minute pitching stint.

``I don't know if there is anyone who can put an exact cause,'' Craig said. ``It might be that his pelvis twisted too far.''

Wells, who pitched a perfect game for the New York Yankees against Minnesota last May, was acquired last month along with reliever Graeme Lloyd and second baseman Homer Bush for five-time Cy Young Award winner Roger Clemens.

Wells began his major league career with Toronto.

``He knows what he has to do to get ready,'' Blue Jays manager Tim Johnson said. ``He's just stiff. I think he'll be fine.''