Seems like we're trying one last throw of the dice to get Nate to sign a new contract... https://www.lequipe.fr/Football/Actualites/Transferts-trevoh-chalobah-chelsea-a-la-cote/1271432
Good player. Versatile too and will only improve. But as you allude, no chance he's coming here unless Nate is staying here.
I'd say there's no chance we're signing a good player who plays in two positions where we need reinforcements.
Has apparently jetted off with Chelsea on their pre-season tour - doesn't suggest any kind of deal is imminent.