Matt Targett, has been OK at best during his time filling in for the injured left-back. He had some good moments like his cross to Ings for the first goal in the Arsenal match. But, he has had as many shaky moments to go along with those moments of quality.
There is no reason to believe Bertrand would not be able to come back and fit into Hasenhuttl system. The Englishman has always enjoyed getting forward and a proven crosser of the ball. He is also very solid defensively and obviously another leader on the pitch.
He has been sorely missed and it will be a breath of fresh air to have him back with the squad