The Indianapolis Colts are making a big upgrade to their secondary, having agreed to sign former Minnesota Vikings safety Camryn Bynum to a four-year deal, according to Tom Pelissero of the NFL Network.

Here's a look at five current NFL free agents the Minnesota Vikings can sign to replace Camryn Bynum, who signed Monday with the Indianapolis Colts.

To be fair, Bolden, 25, was acquired as a depth piece for the safety room -- not a replacement for Bynum. The Vikings are hopeful to have Harrison Smith return this season and re-signed Theo Jackson to an extension that suggests he's going to see the field more.