The Spaniard has been linked with a move to Manchester United, who have seen two bids for the player rejected, as well as a return to Arsenal during the current transfer window.
However, Martino believes that Fabregas will stay at Camp Nou and admits that he is more worried about whether or not captain Carles Puyol will recover from a knee operation.
"Fabregas is still our player and he will be with us for this season," Martino told AS.
"Right now I'm more worried about whether Puyol will recover."
Fabregas started Barca's 7-1 win in a friendly against Thailand on Wednesday.