It's HUGE challenge for Arsenal based on their form, not just recent but for the past 2-3 months. They've scraped several wins, late goals at Everton against the run of play, laboured in all their CL matches, only just scraped past Mansfield in the FAC, lost a 2-goal lead at Wolves.
They then had several chances to show the world they are the still team to beat then one after the other failed them miserably. Lost to us in the Carabau final, then lost to Championship side Southampton in the FAC, lost at home to Bournemouth, then lost their chance to effectively seal the title against us on Sunday.
Their season is all but in tatters and their confidence must be on the floor. They're two matches away from potentially winning nothing at all, one more PL defeat and a loss they can't overturn in the CL all but finishes them off. Tonight, losing the lead after being on top for all that time was yet another punch to the gut, make no mistake, and it's going to be some comeback to win their remaining 5 in the midst of two tough CL matches v Atletico, a comeback I don't think they're capable of even in their prime.