 Complete the following phrase:  Matip began his professional career with Schalke 04 in 2009, and was part of their teams that won the DFB-Pokal and DFL-Supercup in 2011. He totalled 258 competitive appearances and 23 goals before moving to Liverpool on a free transfer in 2016, where he won the UEFA Champions League in 2019, starting in the final. He also won the UEFA Super Cup in 2019 and the Premier League in 