All four sides which were promoted out of League Two last season are poised to survive in the division above this season.
Bolton Wanderers, Cheltenham Town and Cambridge United all secured automatic promotion to League One last season, while Morecambe booked their place in the division via the play-offs.
The final weekend of action in League One takes place this weekend with the three automatically promoted teams all confirmed in the division next season.
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Morecambe are two points clear of the drop zone and can make certain their status with a victory or point against Sunderland at the Mazuma Stadium.
Should Fleetwood Town and Gillingham both fail to win, then Morecambe's place in the division will be assured anyway.
Two teams out of the quartet take on one another this weekend, with the Robins taking on Cambridge.
And Cheltenham boss Michael Duff, whose side lost at the hands of Wanderers last Saturday, believes his side, the U's and the Shrimps will have defied the odds to beat the drop this campaign.
He believes Wanderers are 'a different kettle of fish' in that respect, but is encouraged by all four teams which came up last season on the verge of beating the drop this campaign.
Duff told GloucestershireLive : "They’ve (Cambridge) had a brilliant season, they’ve had their ups and downs, as have we. But us and them, along with Morecambe, would have been most people’s favourites to fill three of the bottom four and then one other.
"Bolton are a different kettle of fish because they are a huge club. The fact Morecambe have an opportunity to get out of it and all three clubs, four if you include Bolton.
"Mark has done a brilliant job and built on last year. They have goalscorers in Joe Ironside and Sam Smith, who we know really well because he did brilliantly for us last year.
"It’s built on solid foundations and they are never out of games, last week aside but there were mitigating circumstances to that. The job he’s done since he came in deserves loads and loads of credit."
