McKenna felt a problem in his groin during training on Monday
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Preston midfielder Paul McKenna could be out for the rest of the season after picking up a groin injury in training.
The 29-year-old, who was recovering from surgery on his hernia, was set to make a return to the side for Saturday's game against Leicester.
Boss Paul Simpson told the club website: "He's not been right since he had the operation and we have booked him in to have a scan.
"We probably won't see him again this season, so it's a massive blow."