He said: "I'll see a couple of old friends but there will definitely be no friends during the game on Sunday.
"I couldn't have predicted what has happened to Hull. Certainly, a lot of people wrote them off at the start of the season. But they're having a great start and hopefully they can continue that — after Sunday.
"I know the lads there so hopefully I can pick their brains better than they can pick mine."
Hull were so determined to hang on to Campbell at the end of last term that they offered United a club record £7million for a permanent move.
But the England Under-21 international was determined to make his mark on a bigger stage.
Brown said: "Fraizer's loan spell was one of the main reasons why we're in the Premier League.
"You can look at many contributory factors: the goal that Dean Windass scored against Bristol City [in the play-off final] or a lot of people will say the 18 clean sheets are why we're here.
"But Fraizer's goals are certainly part and parcel of us being promoted.
"It was a team effort last season, no doubt about it but the lad came in and he was bright, fresh-faced and played the game in a way that reminded me of myself to a certain extent.
"You could kick me all day but I'd just get back and keep running. I'd probably even laugh at people doing it.
"Campbell's pace is one of the biggest assets that he has and he's a genuinely great kid."
Campbell's five-star performance in Poland yesterday has merely added to the dilemma facing Juande Ramos as the Tottenham manager contemplates his best strike force.
The feeling shared by Ramos and assistant Gus Poyet is that expensive Russian import Roman Pavlyuchenko cannot play alongside England's Darren Bent because their styles are simply too similar.
But then neither Pavlyuchenko, cup-tied against Wisla, nor Bent are effective as solo strikers.
Last Sunday's desperate defeat at Portsmouth proved that. Yet Bent clearly gained from Campbell's presence in the UEFA Cup clash, especially in the second half when Campbell pushed up into what almost became a 4-4-2 formation.
Leaving Pavlyuchenko out of Sunday's game would be a huge decision on the part of Ramos.
But Campbell insisted he wouldn't let his boss down were that to happen.
"I've enjoyed playing next to Darren," he said. "But I can play with any of the players. I'm not fussy, as long as I'm on the pitch. I enjoy playing football and that's what I want to do."
The other dilemma facing Ramos is whether to risk his skipper Ledley King so soon after the Wisla game.
In the normal course of events King's weak knee would count him out of Sunday encounter.
But these are not normal times and King's partnership with Jonathan Woodgate, so effective yesterday at the heart of central defence, could prove the foundation upon which Ramos might build upon.
King said: "Hopefully I'll be involved, we just have to wait and see.
"At the moment we're not taking any risks. We're just trying to get me involved in certain games but it is tough because I want to play."