The Red Sox could have competition for Starlin Castro:
Seattle's newly acquired Dee Gordon might be nominally available.
How about Rick Porcello and Jackie Bradley Jr. for Dee Gordon and lefty reliever Marc Rzepczynski?
Masslive columnist Christopher Smith today suggested the Red Sox trade Porcello to clear payroll space:
http://www.masslive.com/redsox/index.ssf/2017/12/how_boston_red_sox_should_resp.html#incart_river_index
A Gold Glove winner at second base, Gordon could fill in for Dustin Pedroia before testing his defensive skills as Bradley's replacement in center field.
Gordon is owed $38 million over the next three years with a team option for a fourth year. Bradley, who is only one year younger than Gordon, remains under team control for three years at at a total cost of, say, at least $24 million (including a projected 2018 salary of $5.9 million). Gordon has posted 9.1 fWAR over the past three seasons (with a suspension-shortened 2016), including 3.3 fWAR this year. Bradley has posted 9.8 fWAR over the past three seasons, including 2.3 fWAR this year.
Porcello has two years and $42 million remaining on his contract while Rzepczynski has one year and $5.5 million left on his pact.
After signing a five-year, $50 million extension, Gordon would count only $10 million for luxury tax purposes, meaning the Red Sox could assume $15.5 million, while shedding about $26.3 million, for the 2018 calculation. That frees up money to pursue free agents.
OK, the proposal is not realistic ... but I was bored.