Bradford midfielder Kyel Reid is manager Phil Parkinson's only injury concern.
Reid, nursing a troublesome groin in recent weeks, was forced out of the second leg of the Bantams' semi-final win at Burton and could face a late fitness test.
Will Atkinson and Zavon Hines may come into contention if Reid fails to make it , while Parkinson will otherwise select from a full-strength squad.
Parkinson said: "Reidy has trained and we'll continue to monitor him. He's a good player, but he'll have to be right in my mind for me to play him because we've got other good players as well.
"Everybody has trained well this week and looking confident. Kyel was the only one who missed last week's training, but that was more precautionary than anything else."
Northampton will be almost at full strength for the end-of-season showpiece.
Alex Nicholls is the only man not available to Cobblers boss Aidy Boothroyd. The striker has been absent since suffering a broken leg in October.
It means Boothroyd has several selection issues to ponder, most notably in defence.
Nathan Cameron was outstanding in both legs of the semi-final against Cheltenham but his place comes under pressure from club captain Kelvin Langmead, who is fit again after a knee injury.
Joe Widdowson has also recovered from his knee problem and comes back into the reckoning after making a return to training this week.
Saturday's meeting will be the fifth time the two clubs have clashed this season.
Bradford edged both league games 1-0 and narrowly got the better of Northampton again in the FA Cup first round, winning on penalties following a 3-3 draw in the replay after the initial tie at Sixfields had finished 1-1.