If no Lennon, we have Mirallas, Deulofeu and Pienaar as our only three true wingers. We saw enough of Naisy and Barkley floundering out there last year and it doesn't seem Cleverley's forte either. As much as I love old Ossie and think he's still got some gas left in him, he's more of a back-up #10/CDM in my mind than any competition for a winger. If we're consistently playing a 4-2-3-1 as we have been virtually all of Martinez's reign, we need more than three wingers to fill depth, Europa League or not.
That doesn't account for the fact that he will push all three of those for places with his work rate and his consistency in tracking back, not to mention what he did for Coleman to revive the latter part of his season. With Mirallas and Deulofeu both picking up knocks before the middle of August, I say we need Lennon and 3 more.