Director of football Jason Wilcox said: “Bringing in Matheus was one of our main priorities for this summer, so we are delighted to have completed his signing so early in the window.
“He has proved his ability to succeed in the Premier League as one of the most exciting and productive forwards in England during his time at Wolves, and, before that, in Spain and Germany. He has all the qualities we are looking for as we seek to build a strong, dynamic and entertaining team capable of challenging for the biggest honours.”