More than a month after three Clemson players were suspended for testing positive for ostarine, no official explanation has been offered by the team or any of the players.

Tigers coach Dabo Swinney told reporters from the Charleston Post and Courier that nothing has been ruled out – including the possibility that the banned substance was in a team-issued supplement.

“There’s a chance that it could come from anything,” Swinney told Grace Raynor and Gene Sapakoff. “They’re going to test everything and look at everything. And that’s the problem. As you really look at this stuff, it could be a contaminant that came from anything, that was something that was cleared and not a problem, and all of a sudden, it becomes there was something.”

Swinney further elaborated on that possibility.

“You can research articles, there are a lot of times when things are cleared and end up having a contaminant in it because of where it was processed, the factory it came from, whether there were other things there,” he told the paper. “So there’s a lot of that. There’s a case out there that there was a contaminant at a testing lab. There are lots of different things and the legal people are involved in that.”

Dexter Lawrence, Braden Galloway and Zach Giella were suspended prior to the Tigers appearance in the College Football Playoff semifinal Cotton Bowl game against Notre Dame. They were also suspended for the national championship game against Alabama, as well as the 2019 season. Lawrence, the headliner of the group, declared for the NFL Draft.