"Ultimately, every manager has their own style and way of managing their squad. Unai Emery is an expert on player performance. How do you do that? I think it has a lot to do with each person's philosophy," he told reporters.
"We built our friendship through our clashes. It's a joy to know that you're going to meet one of the coaches with the greatest European career. He's a coach who takes care of his work. Aston Villa have improved under Unai Emery."
Asked if his fellow Spaniard gets enough recognition for his achievements, he said: "I don't know because I don't read the press and if he lacks recognition I beg you, you have to give it to him, he has always helped his teams progress, he has unlimited energy, he has won many titles. I hope he doesn't get his results in the double confrontation against us but I wish him the best."