However, as part of the deal, the Portugal Under-21 international will spend one year on loan with German side FC Nuremburg.
Goncalves was the subject of a £1miliion bid from the German side late in June but that was booted into touch by Vladimir Romanov who valued the player at double the price.
But now with the all important paper work completed, Goncalves will join his new colleagues at the Easy Credit Stadium and the Bundesliga side have the option to make the move permanent after the end of the year-long deal.