Percy Harvin's NFL return is already over. The Bills announced Monday that Harvin has been placed on the team's reserve/non-football illness list, which means the receiver won't be allowed to play again in 2016.

There's a good chance the Bills' decision could lead to a second, and more permanent, retirement for Harvin.

The receiver's first retirement ended in November after the Bills talked him into playing again. At the time, Buffalo had zero depth at wide receiver, so they decided to give Harvin a call.

Although he wasn't planning to make a comeback, the Bills were eventually able to talk Harvin into making a return.

"I actually thought I was done. I was at peace pretty much the first five weeks of the NFL [season]. I really wasn't focused on football, I didn't have an urge to go play. I was just kind of relaxing and letting my mind just chill," Harvin said in November after his return. "As the five weeks went by, the next month came and the body started feeling good, so the mind started wandering a little bit."

However, the return didn't last for long. Harvin played in just two games before he started to suffer migraines. The receiver caught two passes for 6 yards in his final appearance of the season, a 16-12 Bills win over the Bengals on Nov. 20.

According to coach Rex Ryan, Harvin wanted to keep playing, he just physically couldn't do it.

"He was doing whatever he could to try to play, but I don't know if that was in his best interest," Ryan said, via the Bills' official website. "We were trying to make sure he's well."

Harvin's first retirement came after the 2015 season. The Bills receiver, who was selected by the Vikings with the 22nd overall pick in the 2009 NFL Draft out of Florida, has played a total of seven and a half seasons in the NFL.