Offer him a two year contract on a reduced salary.
Personally not sure there is a kepper experienced enough to come in and be guaranteed to handle the pressure that is available, not from the premiership anyway, seen very little of Costa who seems the big choice.
Henderson rightly is most certainly off. if we release DeGea we are literally left with Heaton and would need to either sign two keeper or loan one alongside a signing.
Say just as an example DeGea signs for 2years on £250k per weel, its £12m for a season of his experience and though he may not be at the level of 5/6years ago or as suited to the modern game, he is still a very good keeper.
If we bring someone in, they do well we can sell DeGea in a season on a cheap fee with a year left on his contract, if a new keeper struggles or flops we have two seasons of DeGea possibly....to me that seems much better than left without a keeper at all pretty much in the summer.
We need two defenders, a midfielder and two strikers minimum this summer....I think adding two keepers to that list is a step too far in our purchases