The 25-year-old, who signed from Stockport in the summer, can play either right-back or centre-back.
He began his Millers career on the right at the start of the campaign, but is currently forging a strong central pairing with Nick Fenton following the injury to skipper Ryan Cresswell.
"I am not too sure where I am best, I wasn't playing well at right-back at the start of the season and I didn't reach the heights I wanted to, but since I have gone to centre-back people seem to be pleased with me." Johnny told the PA Sport
"I enjoy both, I like getting forward at right-back but I like defending as well. If the gaffer asks me to play either I will."
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Source: PA