Swindon defender Raphael Rossi Branco says their two matches during the Easter weekend will decide which league the club will play in next season.
They are 22nd in League One with four games to go, three points below Gillingham, Shrewsbury and Bury, who are all just above the drop zone.
The Robins host 13th-placed AFC Wimbledon on Friday before Monday's trip to face 14th-placed Walsall.
"The next two games in four days are massive," Branco told BBC Points West.
"It is where we are going to decide where will be next season."
After four straight defeats in March, struggling Swindon have picked up seven points from their past three games.
"If you asked most people four games ago, everyone was saying Swindon are down to League Two," Brazil-born Branco added. "Now we are just three points off. So everyone is believing."
Swindon have played in the third tier since winning promotion from League Two in 2012.