The one-year contract for $12 million is pending a physical. The person spoke on condition of anonymity because there was no official announcement.
Youkilis is expected to play third base while Alex Rodriguez recovers from hip surgery. Rodriguez plans to have the surgery in mid-January and could be sidelined until the All-Star break or beyond.
Eric Chavez, A-Rod’s backup for most of last season, joined Arizona last week. The Yankees considered several options as a stopgap at third, including Jeff Keppinger and Mark Reynolds, but both accepted deals with other teams.
The Yankees made the offer to Youkilis last week at the baseball winter meetings. The agreement was first reported by Fox Sports.
Youkilis turns 34 in March. He played third base and first base last season for the Boston Red Sox and Chicago White Sox.
Youkilis was traded to the White Sox last June as Boston’s new management reshaped the Red Sox roster. He combined to hit a career-low .235 with 19 home runs and 60 RBIs.
An All-Star in 2008, 2009 and 2011, Youkilis won a Gold Glove at first base in 2007. He is a .283 hitter with 148 home runs in nine seasons, and was on Boston teams that won the World Series in 2004 and 2007.
For years, Youkilis was one of the more prominent faces in the fierce Red Sox-Yankees rivalry, and his intensity made him among the more popular players at Fenway Park. He and Yankees pitcher Joba Chamberlain had a feud that exemplified the ill will between the clubs — the inside fastballs that caused the trouble tapered off in recent seasons and now they’re teammates.
With the Yankees, Youkilis could also play first base to give Mark Teixeira a break and could be the designated hitter.
There is still uncertainty about when Rodriguez will return. He is a 14-time All-Star and baseball’s priciest player, with his current overall contract worth $275 million.
Rodriguez hit .272 with 18 home runs and 57 RBIs last season, and is fifth on the career homers list with 647. He slumped to .120 with zero RBIs in the playoffs, and was benched and replaced by a pinch hitter in key situations.