Spiller arrives in New Orleans after an inconsistent few seasons with the Buffalo Bills, where he showed signs of becoming an elite rusher only to be pushed back by injury.
The five-year veteran was selected with the ninth overall pick by the Bills in 2010 and he made 36 starts for the franchise, carrying 668 times for 3,321 yards and 12 touchdowns.
He spent seven games on the sidelines last season with a collarbone injury, managing only 300 yards rushing as well as catching 19 passes for 125 yards in his other nine games.
The Saints have also acquired linebacker Dannell Ellerbe from the Miami Dolphins in a trade for Stills, who becomes the second receiving threat to be traded by the franchise this week in the wake of Jimmy Graham’s departure for the Seattle Seahawks.
Ellerbe was signed as an undrafted free agent by the Baltimore Ravens in 2009 but had spent the last two seasons with the Dolphins – he started their 2014 season opener but spent the rest of the year on injured reserve.
Still was drafted by the Saints in 2013 with the 144th overall pick and logged 95 receptions in his two seasons for 1,572 yards and eight touchdowns. He had a team high 931 receiving yards last season.
In another roster move, the Saints have waived defensive back Corey White.