The Red Sox have scouted both Alex Rios and Michael Young recently, according to Nick Cafardo of the Boston Globe (on Twitter). Cafardo adds that the team is likely to scout Jake Peavy's next few starts for the White Sox as he returns from the disabled list. In a separate tweet, Cafardo reports that the Yankees and Red Sox are both likely to scout Aramis Ramirez next week when he returns from the disabled list.
Boston's in Rios is somewhat of a surprise, as both Shane Victorino and Jacoby Ellsbury have played well across the board, and Daniel Nava is hitting .288/.374/.429 while playing the outfield corners. Nava's OPS has declined in each month this season, however, and he grades out as a poor defender according to both Ultimate Zone Rating and The Fielding Bible. Rios would also present the Sox with a right field option if they wish to move Victorino to center field in 2014, should Ellsbury sign elsewhere (my own speculation).
The Young connection makes sense in light of recent reports that they're looking at upgrades on the left side of their infield. There's said to be "intense" interest in Young from a number of teams, and the Phillies could probably move him even if they don't wish to fully commit as sellers.
Ramirez hasn't hit for much power this season when on the field, but he's hitting .271 with a .359 on-base percentage, which should appeal to both teams. Neither has received much production at the hot corner. He's under control through 2014, but the $16MM salary that he is guaranteed next year could be prohibitive for interested parties.