Caparros current deal was set to expire at the end of the season.
“It gives me great satisfaction to have a fourth year in a club as big, important and historic,” he said.
“If anything, I have more hope now than the first day. We will now continue to work as before. I had no doubts. I enjoy every [training] session and this has made me enjoy being here and no doubt I will continue to do so. Now we have to aspire to new challenges.”