Forgive me... Its not a couple, its thought to be four they are going to need from those leaving and out of contract (Milner, Lampard, Sinclair and Guidetti)... then add to this the rise in the regulations then they will be looking to fill these spots. They would not comply with FFP if they spent 30-40m on each one so they would need the odd player that cost less. Because of the rise in the numbers within the 25 man squad they would need to get rid of the Dzeko's and Negredo's, even Navas to fulfil the criteria.
Its not that far fetched that Lennon could be a decent squad piece for Emirates Marketing Project in the slightest and at a decent cost, swapping for Negredo would be good business for them IMO.