Just 1 season.
IMO, He could do this right now in 2014 perhaps, and save himself some scrambling in summer, 2015
when their contracts are both up, and a bunch of other players' contracts have to be dealt with.
Salaries would stay the same.
I could be wrong, but I bet they'd do it.
And it would buy us 1 more season for our FW prospects to come along.