The Pilgrims made a renewed attempt to loan Cox back to Home Park after the success of last season's spell in Devon, but a deal is yet to be struck.
"There have been tentative inquiries, but nothing concrete yet," he told the Swindon Advertiser.
"Obviously Plymouth have been spoken about as one of them. He's part of the squad. Until I hear differently he's part of the squad and I'll continue to use him."