Harry Kane will play in the final match despite missing media commitments, according to Spurs boss Antonio Conte.
Kane and other players and staff have been ill, but there was no food poisoning outbreak.
If Spurs win at Norfolk on Sunday, they will qualify for the group stage.
The virus is the last of the problems, according to Conte.
Gary Lineker, a former player and Match of the Day host, said on Friday that he had heard of a food poisoning outbreak at his old club.
On the final day of the 2006 season, Spurs lost to West Ham and were denied a spot in the playoffs, which was dubbed Lasagne-gate.
If the Gunners beat the Toffees at home on Sunday, they will finish ahead of the Spurs if they lose at the Canaries.
The Italian said he was not interested in going deeper into the story.
I think we are in a good place. We worked well this week and prepared well. We have to be focused.
Kane has scored 16 times in the premier league this season, five more than his teammate Son Heung-min, and four in his past four top-flight appearances.
He was supposed to attend a media event on Friday, but withdrew as a precautionary measure.
In the last game we had Dejan Kulusevski and he didn't train on Saturday, but he was good to play, so for sure Kane will be fit.
Harry doesn't want to miss this type of game.
There were at least three or four cases of stomach problems surrounding the previous match, when Kane scored a decisive penalty.
In this week, we had a couple of cases, but we overcame them.
One day members of the staff were not feeling well. I don't know why but we faced this situation this week.