Adam finds himself battling for a place in a congested midfield, but he is relishing the chance to test himself alongside top international stars.
"I think the competition for places will be good for the club. I thrive on that type of challenge and I'm sure the other lads will as well.
"I want to learn and there are some of the best players in the world at this club, so if I can learn from them I am going to improve as a player. That is my aim.
"I see this as the perfect development for me to come here, play with such wonderful players and hopefully help the team to win trophies, because that's the most important thing."