Garcia says the midfielder has effectively replaced star striker Karim Benzema with his surprise goalscoring so far this season.
He stated, "Madrid was smart by replacing Benzema with a player with different and very good characteristics. They are a complete team, physically strong, I also liked the signing of Joselu.
"We are also a great group, but we will need to be humble above all and give 120%."
Garcia also said: “The Champions League is the most beautiful competition, playing in it is always special. With his anthem you feel a huge push and it makes you realise that you are there.
"Napoli must play it every year, we have returned to be among the top four in Serie A and we can enjoy this match. Madrid is one of the greatest teams, I think they have won five Champions Leagues in the last ten, and the last one with the great coach they know well and who is still there."