That is the damning verdict of former Premier League manager Graeme Souness.
The ex-Liverpool and Newcastle boss has ruled out the Gunners’ chances of qualifying for the Champions League.
Unai Emery’s sixth-placed Arsenal are just one point behind in-form United with 12 games still to go.
And heading into Chelsea’s clash with Manchester City at the Etihad, the Blues are level on points with Arsenal, ahead only on goal difference.
But Souness believes Chelsea and United have the strength and momentum between them to ultimately see off the Gunners in the race.
Ole Gunnar Solskjaer’s Red Devils are flying, having won 10 out of 11 games in all competitions under the Norwegian.
Chelsea, meanwhile, have been far less consistent of late, but brought in a significant addition in the January transfer window.
While Arsenal dithered due to their highly restricted budget, signing just Denis Suarez on loan from Barcelona, Maurizio Sarri teamed back up with Gonzalo Higuain.
“Chelsea will be looking over their shoulders because United are dangerous”
The world-class Argentina striker has already bagged two goals in a Chelsea shirt.
And Souness is backing the man on loan from Juventus to lead the Blues’ charge for Champions League football.
“It’s a straight fight between Chelsea and Manchester United for fourth now,” Souness told the Sunday Times.
“But Chelsea will be looking over their shoulders because United are dangerous.
“And, right now, the momentum is there with them and they are on a roll.
“Chelsea will win more games with Higuain scoring goals for them, but we will have to wait and see if he can take them to fourth place.”
Title-chasing City can seriously damage Chelsea’s hopes of a top-four finish by beating them this afternoon at the Etihad (4pm).
A 6-0 thumping would even send the Blues below Arsenal on goals scored.
Although a victory against the odds for Sarri’s men would see them go three points clear of the Gunners and back into fourth spot.