"We don't need to sell anyone," Martinez told the Western Mail. "We don't have to sell players and I don't want to sell players. I'm very proud of that."
Martinez is adamant any transfer this summer will only be done with the interest of the club at the forefront of his mind.
"Even if a Premier League club meets our valuation of a player, then we will have to see if it is a good decision for Swansea.
"If it is something that goes against this club, it won't happen.
"Everyone has a price, but the good thing is about this club is that we don't have to make a decision from a financial point of view. Every decision will be based on footballing reasons.
"We don't have to be worried about losing players, just proud that Premiership clubs are interested in them."