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McCain, 27, is coming off the worst season of his career. He was toasted by Eddie Royal in the 2013 season opener and continued to struggle the rest of the way.
At 5-foot-9 and less than 190 pounds, he's purely a slot corner and special teamer.
Dale Lolley of the Washington Observer-Reporter recently wrote that the Steelerswill address one of those two positions in the first round, with the top targets being Michigan State cornerback Darqueze Dennard, Oklahoma State cornerback Justin Gilbert, Texas A&M wide receiver Mike Evans and Florida State wide receiver Kelvin Benjamin, "pretty much in that order."