Chelsea will have to pay up big in their pursuit of Hulk, according to Porto president Jorge Nuno Pinto da Costa, with the Blues considering making a move for the striker.

Andre Villas-Boas admitted this week that he would consider a move for Hulk in the future, with the under-fire manager telling a Portuguese radio station: "We have Kalou and Malouda, both of whom are nearing the end of their contracts, while Juan Mata and Daniel Sturridge are the future.

"As such, there will surely be a place to fill and I see room for an explosive player on the wing, someone who is strong in one-on-one situations and Hulk fits that profile."

And now, as Porto consider their position on Hulk, Pinto da Costa has admitted that he will not be selling the star for anything less than his £85 million exit clause.

"I've said it before, we would not sell Hulk and therefore Chelsea must activate his contract," Da Costa said, as reported by

"We know there is lots of interest from Europe, but the player has told me privately Chelsea is his preferred destination."

Villas-Boas' future at Chelsea is currently tenuous, with the manager under increased pressure following the Blues' loss to Napoli in the Champions League and their standing in the Premier League table.

But should the former Porto man be able to convince Roman Abramovich that his money will be well spent on Hulk, the side could be set for an overhaul in the summer.