In the following season (Torneo Clausura) he became a more important part of the squad and would lead Colo-Colo to their second championship win in a row. Colo-Colo would go on to win the game 2-1 and win the championship as well. Bayer had tracked his progress for some time and his good showing at the U-20 World Cup that year convinced Bayer Leverkusen director of football Rudi Völler to make the trip to Chile to convince the 20-year-old to sign. His good showing caught the eye of scouts from various European clubs. The two clubs then agreed on a fee of US$11 million with Bayer Leverkusen, paying $7.7 million for 70% ownership of his contract.