Williams, 26, started eight games for the Saints last season (14 total appearances), registering 44 tackles, an interception and a sack.
In his four-year career, Williams has accumulated 151 tackles, four picks, two forced fumbles and two sacks.
The Saints are loaded in the secondary. Marshon Lattimore and Janoris Jenkins will start at cornerback, while the team signed Malcolm Jenkins this offseason to pair with Marcus Williams at safety. Add in Patrick Robinson, who is capable of handling slot duties, Chauncey Gardner-Johnson providing depth at safety and the return of Williams, and the Saints are in good shape.
Williams can also play some safety in a pinch if needed. And with Jenkins capable of playing slot corner, the Saints have a ton of versatility on the back end.
Luke Johnson @ByLukeJohnson
@lkinler60 P.J. Williams advanced stats are roughly equal to (or better than) some more high profile slot defenders Chris Harris: 67.1%, 14.9 yards/comp, 112.3 rating Justin Coleman: 63.1%, 12.1 y/comp, 103.1 rating Desmond King: 83.3%, 11.4 y/comp, 124.3 rating PJ: 65.6%, 12.5, 110.4
It's another reason why the Saints have a strong case to be among a handful of teams with legitimate Super Bowl aspirations this season. The offense is already loaded behind Drew Brees, with Michael Thomas, Alvin Kamara, Emmanuel Sanders and a strong offensive line giving the Saints more firepower than most teams.
But the defense is also fearsome, and bringing back Williams on an affordable deal was smart business for the Saints. His experience and versatility in the secondary provides them with excellent depth at an important position.