First-year Nebraska coach Scott Frost didn’t accuse Oregon State of tampering with players who were on his roster but is taking no chances.

Frost listed Oregon State as one of the schools Greg Bell could not transfer to as a condition of granting his release. Three former Nebraska players have transferred to Oregon State since August.

Frost said he has no doubt those players had contact with people they know at Oregon State. Oregon State had no response to Frost’s comments.