Tottenham's hopes of finishing in the top four were effectively ended with a 2-1 defeat to Aston Villa on Saturday.
Spurs have not won away from home since January and their last victory outside of London was way back in October.
They now find themselves in sixth place and are battling even to secure a Europa Conference League position.
Mason has come in to steady the ship after Spurs sacked Antonio Conte and Cristian Stellini.
Mason has come in to steady the ship after Spurs sacked Antonio Conte and Cristian Stellini, and the former England midfielder wants his old side to sort out their away form.
“Many different things contribute to that. Ultimately it is not good enough for a club this size. You cannot expect to compete where we want to compete with that sort of record,” said Mason.
“It needs to improve. It needs to be a collective, it needs to be driven from all of us. It isn’t good enough. It is nowhere near the level we should be at and it needs to change.
“We’ve had a disappointing season in terms of where we are in the table but many other things as well. There probably hasn’t been that consistency, that alignment and that togetherness throughout the whole club.
“That is probably the most important thing going forward that we are going to change and I am absolutely confident that that will change. I believe that will happen.”
