Fon Williams has signed on a permanent deal, with Lillis currently due to return to Glanford Park next month. His loan at Spotland cannot be extended to the end of the season and the Iron have a 24-hour recall, prompting Dale boss Keith Hill to add to his options.
Fon Williams was displaced as first-choice keeper at Stockport by Matty Glennon and spent the first part of this season on loan at Bury. He has signed for Dale until the end of the season.