6:14pm: The contract will pay Ohlendorf $900K in the big leagues, reports WEEI.com's Alex Speier. Speier also confirmed that Ohlendorf has a minor league option remaining. The Red Sox control the right-hander through the 2014 season.
8:07am: The Red Sox signed Ross Ohlendorf, Peter Gammons of MLB Network tweets. Peter Abraham of the Boston Globe confirms that the right-hander is in Red Sox camp in Fort Myers, Florida and MLBTR has confirmed that the sides agreed to a minor league deal.
Ohlendorf pitched respectably out of the Pirates' rotation in 2009-10, when he posted a 3.98 ERA with 5.9 K/9 and 3.1 BB/9 in 285 innings over the course of 50 starts. However, the 29-year-old Princeton graduate struggled in 2011, posting an 8.15 ERA in nine starts and allowing nine home runs in 38 2/3 innings. The Pirates released him after the season.
Mike Axisa contributed to this post.