Rival managers Chris Wilder and Paul Cox believe League Two will be even more competitive this time around.
The bosses will lock horns on Saturday when their Northampton Town and Mansfield Town sides kick-off their season at Sixfields.
Just 12 points divided eighth-placed Oxford United and relegated Bristol Rovers in the final table last season.
And with big-spending Luton Town returning to the Football League and Tranmere, Carlisle and Stevenage entering via the League One trapdoor, the competition is set to be even more intense.
Stags boss Paul Cox said: “League Two was a tough league last year and a lot of teams have added well to their squad so it is going to be even tougher this time.
“We will have to fight, scratch and bite to get the points this year.”
And his views were echoed by Northampton boss Chris Wilder, who said he expected the new season to be a tough battle.
“There are some quality sides in League Two who have done a lot of business this summer and they will be strong,” said Wilder.
“Bury have recruited well, so have Portsmouth and the teams who came come down will fancy their chances, as will Luton and Cambridge who have come up.
“It is tough, but who knows what will happen, League Two is very hard to predict.”
Portsmouth and Bury have been installed as joint favourites to lift the League Two crown at 7/1 with Paddy Power.
Northampton are priced at 18/1, while Mansfield are 33/1 to repeat Chesterfield’s title-winning success.