The chance of his return has been discussed in the Riders front office, but officials say there are a lot of moving parts.
The 2013 Grey Cup MVP became an unrestricted free agent earlier this week after the Oakland Raiders cut him loose.
Sheets has contacted the Riders and told them he might be interested in coming back once he's exhausted any NFL opportunities.
However, from the Riders' point of view, Sheets, who tore his Achilles tendon last August, has a lot of question marks next to his name.
"Obviously, his health, first of all," assistant general manager Jeremy O'Day said. "He's not even fit to play football as of right now. We're aware that he's started running but that's as far as we know about that."
Then there's the matter of baggage.
Sheets has tweeted about alleged statements made by head coach Corey Chamblin that there were "character issues" surrounding his departure from Saskatchewan.
"Not concerned with what he said, thought it was funny," Sheets said in a tweet on Wednesday.
O'Day didn't get into that subject, but also didn't leave anyone with the impression a deal is in the works.
"So, there's a lot of questions," O'Day said. "Does he want to come back? We don't have an answer to that."
Off the field, Sheets had his share of controversies. Following domestic abuse charges in 2013, the Riders said Sheets was down to his last strike.
After he signed with the Raiders last winter, he also dealt with pot possession charges in Estevan.