He told the Evening Post: "When you look at the other strikers who have been moving around, you are talking about Gorka being worth between £4million, £5million, £6million and £7million.
"Gorka is the type of striker that is the hardest to find and that's the value in the British market.
"We are delighted that we have got him, that his best years are ahead of him and that he will be a Swansea City player for a long time to come.
"Gorka had a spell at the equivalent of a Championship club in Spain, but he didn't enjoy it and after that he wanted to be a leader. He has captained his last three clubs and has averaged 18 or 19 goals in his last three seasons.
"He should have been playing at a higher level, but sometimes it's about someone giving you a chance.
"People look for the wrong things in football sometimes. It's easier to buy a £2million player or a £5million player than to get someone out of the lower leagues who has not been fortunate enough to get a chance."
This article first appeared on JACKARMY.net.