Although the Mexican is closing in on a deal to remain at Woking for 2014, the team has made it clear that it not yet seen enough to commit to a contract.
That uncertainty, with team boss Martin Whitmarsh saying he wanted to see improvements from his new signing in Singapore this weekend, has prompted McLaren to consider other options - including Fernando Alonso.
McLaren pursues Alonso amid Perez doubts
With Perez knuckling down to deliver on track, high level sources with knowledge of the situation have indicated that he has made changes to his off-track support structure too.
AUTOSPORT understands that Perez may be on the verge of appointing a new management company to replace compatriot Adrian Fernandez, who has guided Perez's career for some time.
Former racer Fernandez, who has regularly accompanied Perez at races, is a notable absentee in Singapore this weekend - despite the speculation surrounding the Mexican's future.
Perez declined to elaborate on the situation when approached at the Marina Bay circuit, but he did stop short of denying that he and Fernandez may be about to part company.
"I will announce these things soon," Perez told AUTOSPORT to clarify his management situation with Fernandez.
McLaren also did not wish to get involved in the matter, and made it clear that Perez's management situation was up to him.
"It isn't a matter for us," said a team spokesman.
Fernandez was unavailable for comment when contacted about the matter.