Savic's header completed their 4-0 rout of Blackburn at the weekend.
"Stefan is a good guy, who's come in and done really well," said Hart. "He scored on Saturday and everyone inside the club felt really good for him.
"He's a young lad who's had limited opportunities but he's doing really well.
"Yeah, there's been some banter with him about this game, but it's a big game for both of us.
"We both appreciate that, he's been saying stuff to us and we've been saying stuff to him, but at the same time we respect each other and we're just all looking forward to the game, and potentially what could come out of it for both countries."