As reported by the Portuguese newspaper A Bola, the Colombian international quickly downplayed the message, clarifying that he had in fact "not received a transfer offer from Liverpool."
But it was too late, as Twitter whipped up the rumours and speculation grew that the forward would be heading to Anfield.
The Porto star has been heavily linked with a departure this summer as contract talks between the player and club have stalled. The Portuguese club is anxious to increase his buy-out clause but Martinez believes that will unduly harm his ability to move on should the right club come in for him.
A buy-out clause of £70m has been mentioned in negotiations, which would certainly put off his current suitors - believed to be Chelsea, Liverpool, Arsenal and Manchester United.
The Stamford Bridge side recently purchased Diego Costa from Atletico Madrid but that hasn't stopped speculation linking Chelsea with another move for a top-class striker.
The 27-year-old was an impact player off the bench for Colombia at the World Cup, scoring two goals in the tournament, both against Japan in a 4-1 win in the group stages.
The Anfield club meanwhile are preparing for the departure of striker Luis Suarez, who looks all but certain to join Barcelona. The Spanish giants are reportedly ready to meet his asking price, which is anywhere between £63m and £75m depending on the report you read.
With that kind of money in the bank, Liverpool would be in play for Martinez, who is currently available for around £35m. The Reds would need a like-for-like replacement should Suarez leave despite the £4m arrival of Rickie Lambert.
Divock Origi's imminent arrival would strengthen the squad, but Brendan Rodgers will want an experienced forward to fill Suarez's role immediately next season.