Our goalkeeper will come face-to-face with his former team-mate Carl Cort - providing the striker overcomes a hamstring problem - in our third Premiership match at Newcastle United.
The pair were at Wimbledon together for four years before both departed at the end of last season. Sullivan moved to the Lane on a Bosman transfer while Bobby Robson paid L7m for the services of Cort.
The England Under 21 star marked his home debut with a goal against Derby County on Wednesday night before limping off with a hamstring problem.
Now the ex-Crazy Gang members are due to meet at St James' Park and Sullivan said: "Carl's a very good player. At Wimbledon we used him wide right of a five-man midfield but that's not really what he's about. He's a centre-forward, works up and down the middle, has a great touch and scores a lot of goals.
"He's definitely one to watch but if we defend like we did at Middlesbrough we should go up there feeling very positive."
Meanwhile another of Cort's ex-Wimbledon team-mates is after revenge on Tyneside.
Chris Perry was in the side that lost 6-1 last season's FA Cup replay and admitted: "We certainly owe Newcastle one after that defeat. Obviously it was a night when everything went wrong for us, no-one played well and everything they touched seemed to go in.
"We've got a chance to put it right and I'm sure the lads will be right up for it. We'll want to prove that we are a lot better than that result suggested."
You can watch the Newcastle match live at White Hart Lane on Saturday. It will be shown on the Jumbotron and admission is L5 for adults and FREE for children (under 16s) and OAPs.
Neil Sullivan will be determined not to get Cort out on Saturday.