Fair enough, but I wouldn't worry. Not at this point.
City has pulled out, Chelsea won't even pay Hazard what we're reportedly paying Sanchez. PSG has M'bappe, Neymar and Cavani and doesn't intend to play without a bigger man up top from what we've seen. Real Madrid tend to go for younger superstars that they can have for a while and create a load of buzz about, Sanchez is simply too old for them, and even then they haven't really done many superstar signings lately.
He's already been at Barca and wanted out of there.
Juventus can't compete with our wages.
FC Bayern would be the only ones able to compete and in some need of a new player out wide, although they have Robben, Ribery, James, Müller & Coman with Douglas Costa out on loan. How willing they'd be to jump on Sanchez and compete with us for wages and how willing Sanchez would be to leave the Premier League for a new culture are big question-marks.
As for other English clubs, LFC can't compete with our wages, Tottenham can't, Arsenal he's desperate to leave. Only really City panicking can change as a possible competitor for his signing from my perspective.