Source: Ellsbury market 'fluid and strong'

The market for free agent outfielder Jacoby Ellsbury is “fluid and strong,” according to one baseball source, reaching levels beyond what the Red Sox are probably willing to do.

The Yankees are among the teams that have interest in Ellsbury, the source said, but they are just one of a number of teams in negotiations with agent Scott Boras.

Ellsbury would appear to be a lock to command a salary that will average more than $20 million per year, and it almost certainly will take a minimum of six years to sign him, with a seven- or eight-year deal the more likely range.

“A lot is transpiring with him,’’ the source said.

The Seattle Mariners have been frequently mentioned as a prime contender for Ellsbury’s services, with the Chicago Cubs also rumored as a possible landing spot.

The Red Sox, meanwhile, have remained in contact with shortstop Stephen Drew, who hasn't yet landed the multiyear deal that we reported had taken him out of play for Boston, the source said.