Newcastle went down timidly to a 2-0 Premier League defeat after right-back Daryl Janmaat had been sent off four minutes before half-time for two bookable offences.
The Dutch defender was booked for his second foul on Montero after 17 minutes and, after almost bringing him down again inside the penalty area, he was banished for tugging back the Ecuadorian winger deep inside Swansea’s own half.
“You could see their tactics was basically try and kick him (Montero), and full credit to the referee for spotting it straight away,” Monk said.
“Quite rightly the player was sent off in the end.”
But Newcastle boss McClaren dismissed Monk’s claim that Newcastle had sought to stop Montero by targeting him for rough treatment, with the former England manager insisting his team do not play that way.
“We haven’t got a team capable of doing that and I don’t think the game represents that now,” said McClaren.
“Our team is a football team, not kickers, so I would dispute that. As always, you make your presence known to your opponent, which we did, but there was one tackle too many.
“I thought the red card was harsh, he was a long way from goal and it was a little tug. I thought the referee could have been lenient.”