BOSTON -- The Red Sox activated David Wells from the disabled list on Friday night but the left-hander got hurt again when he was struck on his injured right knee by a line drive.
An examination showed a deep bruise but "no immediate evidence of a serious injury," according to team medical director Dr. Thomas Gill. Wells will be examined further on Saturday.
The 43-year-old Wells has been sidelined most of the season because of a sprained right knee. He had been on the disabled list since April 14, two days after he struggled in his only other start of the season for Boston.
He left Friday night's game in the fifth inning when Tampa Bay's Travis Lee hit him with a batted ball.
Wells reached for the inside of his knee and fell while wincing in pain. He then rolled over onto his front side and, after about a minute, sat up. Another couple minutes passed before he stood up and was helped off the field by pitching coach Al Nipper, trainer Paul Lessard and medical operations coordinator Jim Rowe.
In 4 1/3 innings, Wells allowed one run -- a homer by Carl Crawford -- and five hits with no walks or strikeouts. He threw 53 pitches, 41 for strikes and left trailing 1-0.
Julian Tavarez took over and retired the side without allowing a run.
Wells started the season on the disabled list after undergoing offseason surgery on his right knee and was activated to pitch April 12. He worked four innings in an 8-4 loss to Toronto, allowing seven runs and 10 hits.
Wells, who allowed seven runs and 10 hits in four innings against the Blue Jays, began the season on the disabled list. In a rehabilitation start for Pawtucket last Sunday, he allowed two runs and four hits while striking out three in five innings of a 9-3 win over Scranton/Wilkes-Barre.
To make room on the roster for Wells, the Red Sox optioned outfielder Dustan Mohr to Pawtucket. Mohr began the year there after signing with Boston as a minor-league free agent.
After being called up to the Red Sox on April 11, he went 7-for-40 with two homers, three RBI and 20 strikeouts in 21 games.