Spaniard called up as Hanson pulls out of Seve Trophy
The Swede has been troubled by the problem for most of this season and it forced him to withdraw from Jose-Maria Olazabal's side for the biennial contest against Great Britain and Ireland at St-Nom-La Breteche Golf Club in Paris.
"I am really disappointed not to be able to play in this year's Seve Trophy," said Hanson.
"Everyone knows how much I love matchplay events and I did everything I possibly could to make Jose Maria's team but it was not to be.
"My back has been an issue for pretty much most of the year and it is still not 100 per cent unfortunately.
"I have my defence of the BMW Masters in China coming up in three weeks' time which is part of the Final Series on the European Tour and I want to be in ideal shape for that full run of tournaments, which meant I had to withdraw from this week.
"It is very unfortunate, but I wish Jose Maria and the Continental European team the very best of luck."
Fernandez-Castano, who has made two previous appearances in the event, was delighted to feature again in a competition with which he feels an affinity.
"I really enjoyed the two previous contests I played and it is important to support a tournament with Seve's name on it, not only because of what he did for Spanish golf, but for what he did for the game in Europe and the European Tour as a whole," he said.
"I wanted to show my respect for him. It was a privilege to play under Seve in 2007 and under Thomas Bjorn in 2009, and it is a dream come true for me now to play in the Seve Trophy with Jose Maria as captain."