Potted olive trees

Looking for some advice. We had 3 olive trees growing in the ground and were very healthy here in the south West uk.

Having had to move them for works, they were potted up. One became very water logged and has lots all it's leaves. What should I do to revive it if that's even possible? Prune it right back?

I've added pics of the bare one compared to the other 2.

Thanks

 

Do a scratch test on the bark, if its green underneath the wood is still alive, I usually make a small nick with a knife.
Work your way down, but if it got water logged it could actually be dying from the bottom up so do a small scratch near ground level as well.

 

Ah super. I'll try that out and see how bad it is. May come back for more advice if it's still showing green in the upper trunk. Cheers