For context, and some of this is repeating what I've said previously, I don't think this one is likely because:
1. Press rumours are that the release clause only applies for a brief period in January and expires before our game at Marseille (and if we win that, we'd be confident of qualifying for the next phase of the CL, earning a big wedge and being better placed to spend). You could also potentially throw into the equation that if we were planning / willing to sell Mo this window then the timing on that doesn't really work either (if it happens, it'll probably be after he's back from AFCON).
2. Again, press rumours, but it sounds like City are ahead of us here, so we are in a Caiceido type situation, which didn't end well last time.
3. It's now clear we're not getting a fee for Harvey this year (which was probably paying for Guehi anyway), so our expected cash flow will be down. Also affecting cash flow, we've been shit, as has been covered elsewhere at great length. Although we will probably have budgeted only for CL qualification and staying in this year's CL for one tie after the group stage.
4. From our bargaining position, we'd probably be looking for more favourable payment terms than City, which will make us less attractive to Bournemouth, which means...
5. In order for force Bournemouth's hand to sell to us, we'd have to have really sold the player on coming to us rather than elsewhere, and it doesn't feel like that has happened (a la Moises Caiceido). We don't have the Klopp factor any more. It would really help if City were to get fucked over on 115/130 in the next 24 hours (not happening, obvs), because that's the only reason why I, as not a fan of either team, would choose us over them.
So, I just don't see it (although I'd quite like to be wrong as I like him as a player).