Doncaster Rovers beat high-flying Swindon Town in their last match and Willis knows it will be a tough Boxing Day test...
Coventry City defender Jordan Willis believes the work the City squad put in during the summer will be repaid over the Christmas period.
The Sky Blues face a trip to the Keepmoat Stadium on Boxing Day before the home game against Chesterfield two days later.
It will be a testing time as City look to continue their four-game unbeaten run in the league with the club currently sitting in 17th position.
The last time the Sky Blues traveled to the Keepmoat, they claimed a 4-1 victory and Willis will be hoping for the same again.
Willis said: "I was involved in that game and it is definitely one which has stuck in the memory. It was one of the highlights of the season.
"They'll be on a high after the win over Swindon so it will be a difficult game. It always is against teams who've just come down.
"We've just got to make sure we concentrate on our own performance and build on the game against Fleetwood.
"We've done well away from home recently, against Port Vale and Colchester United, so that will give us plenty of confidence."
Paul Dickov's side claimed an impressive 1-0 victory at Swindon Town in their last match and Willis believes it will be a difficult match.
He added: "We're always looking to take something from every game and that's the way it should be. Make sure you try your best and do everything for the win.
"It will be difficult but this is what we put the hard work in for. The two games in two days is difficult on the players but we'll cope.
"We did it in pre-season where we had four games in a week and our squad was smaller then so we've prepared for this.
"Mentally, because you've done it before, that work in pre-season helps you out because you can tell yourself that you've done it."