From an FFP perspective, yes - we'd be in the clear next season if we did that. The problem, of course, would be cash flow as well as funding the amortization outlay for the other years. So with all things considered, probably not.
Well we would actually be in the clear for almost 2 years - as the amortization cost would be £120 million a year and we are allowed to run a deficit of about £100 million over 3 years
(if we take for granted that we break even on FFP for the last 3 seasons - which we dont do)
No seriously - this is why what Chelsea did was SORT of clever (and why FFP only considers 5 year contracts now ) .
Let's say for case of argument they signed just 5 players for £100 million each on 10 year contracts last summer - and then sold us Mount for £60 million (he is pure profit)
The cost in terms of FFP will be £10 million each season pr player signed - so £50 million in total pr season for 10 years. Short term this is brilliant - long term ..... not.... as they need to include these players in their FFP cost for 10 years. But short term - as long as Chelsea sell home grown talent for £50 million a year - they break even in terms of FFP against the 5 hypothetical players they signed.
The problem is of course that they need to sell £50 million of homegrown talent simply to cover the cost of the players they signed last summer - if they were to sign another expensive player for £100 million - they now need to conjure up £20 m (£100 m divided by 5 years) extra to cover that cost. So chances are that Chelsea need to sell at least one expensive homegrown player each year to be compliant with FFP
And let's be realistic - they haven't got that many anymore.