Nottingham Forest midfielder Radoslaw Majewski admits the Reds' play-off hopes will be dashed if they fail to beat relegation-threatened Millwall.
Forest are two points and two places outside the top six ahead of their penultimate Championship match of the season at The Den on Saturday.
"If we don't get three points from this game we don't have a chance," Majewski told BBC Radio Nottingham.
"There is no doubt, this is our biggest game of the season."
The Polish international added: "We need to have positive thinking - to be in the play-offs we need to beat Millwall."
The Reds have picked up just four points from a possible 18 since March 30 when their run of six successive wins came to an end.
Victory at Millwall will set up a potential final-day showdown against East Midlands and play-off rivals Leicester City at the City Ground next week.
The Foxes, who are one point above Forest in seventh, host third-placed Watford on Friday night (19:45 BST kick-off).
"We have put ourselves under pressure because we haven't won for a few games in a row now," Majewski said.
"We can say we lost two points against Barnsley last week because we had so many opportunities to score.
"Right now, everything depends on this game - a win and it all comes down to the last game of the season against Leicester which everyone is looking forward to if we get these three points."