The Red Sox have reportedly kicked the tires on trading for Pittsburgh Pirates starter Mitch Keller, as Boston looks to strengthen its starting rotation ahead of MLB's trade deadline on Thursday.

The Red Sox are reportedly among the teams that have reached out to the Pirates about righty starter Mitch Keller.

The Red Sox have shown interest in Diamondbacks starters Zac Gallen and Merrill Kelly, according to Rob Bradford of WEEI. With four starting pitchers on the injured list, the Red Sox are looking for reliable options behind Cy Young contender Garrett Crochet, who leads baseball with 141 1/3 innings pitched and 175 strikeouts.