Daily Red Sox Links: Rusney Castillo, Brock Holt, David Ross

Rusney Castillo is joining the Red Sox tonight, and both sides are ready to start the partnership for real. (Gordon Edes; ESPN Boston)

In honor of his call-up, Sox Prospects has a write up on Boston's new outfielder. (Ian Cundall; Sox Prospects)

What will be going on in the last few weeks of the Red Sox season? (Brian Roach; Fire Brand of the AL)

Castillo was signed under a policy that may be changing soon, but the players union is in favor of keeping the current international signing system. (Brian MacPherson; Providence Journal)

Brock Holt has been out for over a week with concussion, and he's receiving further tests to determine if he can return this season. (Jen McCaffrey; Masslive.com)

David Ross has expressed an interest in coming back next season, but his future still remains unclear. (Scott Lauber; Boston Herald)