From what we know Witsel is due back in Russia today and given that he'd have to fly from there to Liverpool to do a medical before any announcement I'd say there's close to zero chance of anything happening until next week at the earliest.
Notwithstanding the fact that the manager himself won't be there to do a press conference until next week anyway. Hopefully no more attractive option presents itself to the player before we have a chance to complete.
Hasn't the Zenit guy stated that Witsel won't be playing in the super cup next Saturday, therefore hinting he won't be at the club. Witsel will complete a medical and sign Friday or over the weekend, you can bet your nuts on it.......faith!