"JP is in some pain," he said. "He's got some damage to his neck, but thankfully he's up and about, he's walking."
McDermott admitted he was disappointed with his side's attack as they slumped to a third consecutive defeat, but was not surprised by the battling performance of his former club.
"Players normally respond to things like that," he said.
"I thought we defended really strong and we created enough chances on attack, but our skill was just poor.
"It's just the way it is at times, we were just off with the ball."