Gilreath joined the NFL in 2011 as an undrafted free agent out of Wisconsin. The 5-9, 169-pound receiver is primarily a punt returner, though in his two NFL seasons he has returned just two punts.
He bounced around teams during the 2011 off-season, first sigend with the Colts then the Rams before landing on the Bills' practice squad. He was signed to the Steelers practice squad in 2012 and was later called up to the active roster. There he had two punt returns in three games for a 4-yard per punt return average. He also rushed once for seven yards.
It's clear despite not finding a permanent roster spot, he is liked enough for teams to keep bringing him in.
Gilreath was second-team All Big Ten as a receiver and return man as a senior. He Finished his college career as the Big Ten all time leader in kick off return yards (3,025). He was also the only player in Wisconsin history to score touchdowns receiving, rushing, on a punt return, and a kick return.
The Raiders will have to make a corresponding roster move though that move is not known yet.