The Red Sox recognize Greg Holland might be a really good fit. But they also have come to understand there are other teams that feel the same way.

According to a major league source, the Red Sox are among the most aggressive suitors for the free agent relievers. There are, however, “several teams” that are showing a similar level of interest.

The Red Sox have been intrigued by the former Kansas City closer even before last Monday’s showcase, in which Holland showed good health and a fastball that sat in the low 90’s.

The plan for the 30-year-old, who underwent Tommy John surgery at the end of the 2015 season, is to not resume throwing for another five weeks.