Following their 3-1 win at Stamford Bridge last month, Spurs were ten points clear of fifth-placed Chelsea in the race for fourth place.
Chelsea have since closed the gap to two points, and Tottenham must now take at least four points from their final two games if Antonio Conte’s side win both of their remaining fixtures.
If Mauricio Pochettino’s men beat Newcastle United on Wednesday night and Leicester City on Sunday, they will finish in third place above both Liverpool and Chelsea.
But Lloris says the players must show the sufficient mental strength to qualify for the Champions League.
“We are in a period of the season where – and it is the same for every team – we don’t have the freshness that we had in September, October and November,” said Lloris, according to Goal.
“It is difficult to play in every game with the same intensity. We do need to question ourselves and realise that the next two games are very important for the future of the club and the future of every player in the dressing room.
“I think we need to put into our minds that it is going to be difficult until the end, until the last game, until the last minute against Leicester because we are in the Premier League and we are fighting against Liverpool, against Chelsea for the top four and they are both top clubs.
“They are used to competing and playing at this level. Now, it is all mental. It is not about fitness or physical condition. It is mental and in this [West Brom] game we lacked a bit of aggression in key moments.
“It’s a bit disappointing because we could have managed the end of the season in a better way. It is up to us. But we need to stay confident and keep believing in ourselves. It is not the moment for doubt.”
Inspiration from the previous run-in
Spurs will be dreaming of replicating their final two matches of last season, when they beat Leicester 6-1 and Hull City 7-1, both away from home.
They certainly won’t want a repeat of the 2015-16 run-in, when back-to-back defeats against Southampton (2-1) and Newcastle (5-1) saw them fall below Arsenal into third place.
There is more at stake this term – Tottenham still qualified for the Champions League two seasons ago despite finishing below their fierce rivals.
Indeed, Spurs could seal a top four finish for a third successive season under Pochettino’s management.
They take on Newcastle at home on Wednesday in the league.