New Blues boss Andre Villas-Boas has been linked with a ?17.5million raid on his former club Porto for wing-back Pereira, while nouveau riche PSG have also been mentioned as a possible destination.
The Uruguay star's representative, Alejandro Savich, claims there have been no formal offers for the 25-year-old, who reportedly has a release clause of ?26million.
But he has primed his client to expect the unexpected before August 31.
"Until now there has been no contact with us," Savich told Maisfutebol.
"In fact, I can say more. This time, we have no offers from any club for Alvaro Pereira.
"I can only speak about the present and the truth is that there are no official offers.
"But the market only closes on August 31 and, until August 31, anything can happen.
"He is aware that he has a contract until 2015 and that for now is focused on FC Porto, but also knows that things change quickly and that any time something could happen.
"If a club can pay the clause of 30million euros? Then we'll see."
Pereira, who can play left-back or left-midfield, has been touted as a potential replacement for Yury Zhirkov, who quit Chelsea last week to return to his native Russia.
The former's stock recently rose when he helped Uruguay win the Copa America and he is due to resume training with Porto tomorrow after being given time off to recover from his international exertions.
Savich added: "Alvaro Pereira will start training on Wednesday with FC Porto."
Porto have already signed a possible replacement for Pereira, beating arch-rivals Benfica to Santos' ?8.3million-rated Alex Sandro last month.
Source: Team Talk
Source: Team Talk