Ebbsfleet will climb into the National League play-offs if they win on Tuesday and Dover fail to beat Tranmere.
The Kent rivals are locked together on 67 points just outside the top seven with both aiming to catch Wrexham.
Fleet, who have a game in hand on Dover and two on Wrexham, take their 10-match unbeaten run to Eastleigh on Tuesday.
They haven't occupied a play-off spot since August but have all the momentum after seven wins and three draws.
Fleet won 1-0 at Barrow on Saturday while the four sides immediately above them all lost.
Manager Daryl McMahon said: "If you’d said at the start of the season with four games to go we’d have an outside chance of getting into the play-offs, of course I'd have taken - in our first season back in the division and how the season’s panned out with injuries at different times.
"Anybody who was at the game on Saturday would have seen a team with huge belief, fighting for our lives to stay in a position to keep our season alive.
"That’s what we’re doing at the minute. We’re just trying to go from game to game to keep the season going and see where we end up, knowing we can do it without any pressure on us."
Eastleigh are 16th and have only won two of their last 12 matches.
McMahon said: "They’ve obviously had a tough week travelling to Barrow and Gateshead on Tuesday and Saturday but we know they’ve got an array of very talented players in their squad and it’ll be a tough game.
"I went to watch them a couple of weeks back when they played Dover and beat them 2-1. They were well worth that win to be fair, played some really good football on the night.
"They’ve got Sam Matthews, who I think is one of the outstanding players in the division, Ryan Broom, Mark Yeates, Andrew Boyce, Gavin Hoyte, some good, experienced players.
"For us, it’s about being the best we can, focusing on what we can do but understanding the quality of the other team too."
McMahon hailed the 76 supporters who made the long trek from Kent to Cumbria on Saturday.
"It's an unbelievable effort," he said. "As much as we’ve got to travel away to games, it's our job to do that. The fans have got to pay to watch us and it’s important for us to make sure we put on a performance for them to be proud of their team.
"To back up the great support we’ve had away from home this season has been really important and the players and staff are definitely aware of that."