Wolves boss Mick McCarthy admits American goalkeeper Marcus Hahnemann has been a revelation this season.
The 37 year-old has overtaken Wayne Hennessey as Wolves' No1 and won a new contract from McCarthy.
McCarthy told PA Sport: "Marcus has had a huge impact. Wayne was fabulous last season but he'd had no Premier League experience and I was aware of that when I signed Marcus.
"When I knew he was on a free transfer last summer, that was one of my first phone calls. I rang him very early in the summer. I think he'd only just got back home (to America).
"I knew all about him but I was very surprised he was available, I have to admit, so I was thrilled to get him.
"Marcus, to his eternal credit, accepted the fact Wayne was number one and he had to dislodge him.
"But he came into the team at a time when I thought we needed more solidity and experience and he came in and played very well. That's why he's kept his slot."
Hahnemann was happy to sign an extension, irrespective of where Wolves would be playing next season.
McCarthy added: "Marcus had a contract whereby if we stay up, and he played a certain amount of games, he gets a new deal.
"But I approached him way before that and said that, irrespective of where we are, I want you to stay and he was delighted by it."