Rotherham are hoping to confirm their 10th summer signing within the next 24 hours.
Millers boss Steve Evans has cut short his summer holidays in order to complete the formalities.
"I've spoken to [chief operating officer] Paul Douglas and I'm confident that the transfer will be completed in the next 24 hours," Evans told the club's official website.
"As always though I will not be revealing anything until the player has put pen to paper and the appropriate documentation has been processed.
"Once I've heard from Paul Douglas that everything is sealed then I will let the fans know straight away."
The Millers are scheduled to report back for pre-season training on Monday morning.
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