Patriots take closer look at safeties Vinnie Sunseri, William Moore

FOXBOROUGH, Mass. -- The personnel wheels are always spinning in the NFL, especially with the New England Patriots, and the past three days have revealed that the club has taken a closer look at two free-agent safeties.

The Patriots don't have any openings on their 90-man roster, but are always exploring potential upgrades. The following is the safety depth chart:

1. Devin McCourty

2. Patrick Chung

3. Duron Harmon

4. Jordan Richards

5. Nate Ebner

6. Cedric Thompson

The top four are viewed as locks to make the roster.

The club also has second-year player Brock Vereen, who has corner/safety flexibility, as well as core special teams player Brandon King and rookie Kamu Grugier-Hill, who are hybrid safety/linebacker types.

Ebner, who inked a two-year deal to stick with the club this offseason, is training with the U.S. Rugby Team.