But the journeyman defender has stepped up to the mark since returning from injury and is keeping teh Colombian international waiting!
And that’s not something the ultra-quick left back is used to but is having to accept his will have to wait given McCartney’s form.
A training ground source claims he has been working his socks off to impress on the training ground and is enjoying the competition for places.
He said: “Pablo is a great lad who has settled in very quickly. He can’t wait to get involved but George is doing well in a winning team so he will have to wait.
“He really is very quick and will cause plenty of problems when he breaks through but it’s not a coincidence that our form has picked up since the loanees arrived and started putting the pressure on those players in possession.”