The Red Sox made a surprising move Saturday when they agreed to terms with free agent catcher David Ross on a two-year contract worth $6.2 million.

The Sox had no demonstrable need at catcher with Jarrod Saltalamacchia and Ryan Lavarnway on the roster. But that may have been the point of signing Ross. Now the Sox can use Saltalamacchia or Lavarnway as a trade chip to fill another need.