Bruce said: "Sulley is a fabulous acquisition for the club. When the opportunity arises to bring in a player of his ability - even in the short term you have to take it, and I'm delighted that we have been able to.
"His adaptability is a great asset. He did extremely well at Portsmouth so he knows the Barclays Premier League well and you have to be some player to move to Inter Milan for the fee that he did. He's a great addition."
Muntari said: "I love the pace, and passion the fans have across the nation. The people are passionate about the game and that makes it exciting. You see young kids at the stadiums watching the game.
"The English game makes me relaxed and happy so I can bring my skills out. I will just try to do my best to help Sunderland go further because they are doing well. I hope I can help the club go to Europe."
And later on Saturday the Black Cats finally sealed he signing of Benin playmaker Stephane Sessegnon from Paris St Germain for a fee of €7 million.
Bruce said on the club's official website: "Stephane can play on the left, on the right, through the middle - he's lightning quick and he's a match-winner. I think he'll be a big hit with the supporters. I predict he'll turn into a crowd favourite.
"Stephane's a little powerhouse with a small centre of gravity, some great dribbling skills and a good shot. His ability to slot in across attacking positions makes him a great addition to what is a young and hungry squad."
The player added: "I am very happy and glad to be here. The transfer has been long and the execution has been tough, but I am very happy. I can't wait to start in the Premier League. It has been my dream for years. The Premier League is the best league to play in; I have always wanted to play here.
"It is a great pleasure to be here and my wish is to give the maximum to Sunderland. I want to thank Niall [Quinn], Steve [Bruce] and Eric [Black] for all the support they have shown to me. This transfer has been difficult but they were always here helping me.
"Sunderland was the place I wanted to be even though there were other teams interested."