If I understand PSR correctly, it would be around £34m considering he is three years into a five-year contract and we bought for around £85m (so he is 60% depreciated). Happy to be corrected if this is not accurate, though.
It's not quite that simple - what you have to compare is the PSR impact if he leaves and the PSR impact if he doesn't - because the latter is far from free in PSR terms.
For 2025 PSR:
Loss write-off: 34m
minus
Wages saved: 5.2m (reportedly on a 10.4m contract, and PSR follows financial year, not season)
Write-off 2025 (which we'd have to do if we don't sell him, so this is a real saving): 17 m
Yielding a net 2025 PSR cost of 11.8 m if he leaves for free. Any transfer fee received above that would be a net PSR gain for 2025.
But then there's also the impact on 2026 (wages, plus writing down the final 17m of the transfer cost). That's a ~ 27 m 2026 PSR benefit just from him not being here. And I suppose half the annual wages for 2027 (ie, the second half of the 2026-27 season) too, which yields another 5.2 m PSR benefit for that financial year.
So what we need to break even depends on whether you're counting just 2025 PSR impact, or if you take a longer view. For 2025, break even shouldn't be much more than 10m. If you take a longer view, we'd benefit significantly PSR-wise even if we paid someone 10m to take him off us. If I have understood this correctly.
I'm assuming here the writedown of the transfer cost takes place ahead of each season rather than on a financial year basis, which I don't actually know if is the case. If it isn't, then the impact on 2025 might be less favorable.
Then of course there is the third option, which is not selling him, but sending him on loan in return for part of his wages covered and/or a loan fee. That could reduce his PSR cost significantly, but all things considered it looks like a pretty good option to move him on, from a PSR point of view.
EDITS: Keep having to adjust the sums because I'm a fecking idiot.