Widnes coach Paul Cullen said: “We thoroughly deserved to lose that final. We got ourselves back in a position to win, and then conspired to lose it.”
Three points for the Vikings would keep them in the Co-operative Championship’s top six, regardless of how well Toulouse perform at Keighley.
Centurions are at full strength, with their only doubts over surrounding how many of their dual-registered players will be with the club this weekend.
Assistant coach Paul Rowley is hopeful that Matty Blythe and at least one other dual-registered player will be available, and has not ruled out all four representing Leigh on Sunday.
Rowley said: “It’s an important game for both clubs. We want second spot, and Widnes have got a really tough run in.
“They’ll be targeting this as a must-win game to help their play-off ambitions. It’s equally important for both clubs, albeit for different reasons.”
Rowley added: “We started the season strongly, but we’ve since had a bit of a sticky patch. Hopefully we’ve reached the end of that spell now.
“It’s now all about peaking and cranking things up for the play-offs.”