D-backs sign veteran Randy Wolf

The Arizona Diamondbacks have reached agreement on a minor league contract with veteran pitcher Randy Wolf, the team announced Friday on Twitter.

Wolf, 37, adds depth to an Arizona rotation that ranks 29th in the majors with a 6.57 ERA. Only the Minnesota Twins' rotation, with a 6.89 ERA, has been worse.

The D-backs' staff took a major hit in spring training when Patrick Corbin, a 2013 National League All-Star, was lost for the season after Tommy John surgery on his left elbow.

Wolf is 132-117 with a 4.20 ERA in 14 seasons with the Philadelphia Phillies, Milwaukee Brewers and four other clubs. He missed the 2013 season because of elbow reconstruction.

He won a spot in the Seattle Mariners' rotation out of spring training. But he asked for his release and went back on the market in late March rather than agree to a clause that would have allowed the Mariners to release him in the first 45 days of the season without having to pay his entire salary.