By Felix Keith Jurgen Klopp has urged Liverpool to “show their class” by handing Joel Matip a new contract after the defender suffered a serious knee injury. Matip has been ruled out for the season after suffering an injury to his anterior cruciate ligament in the 4-3 win over Fulham last weekend. The 32-year-old defender has been with Liverpool since 2016 but could have played his last game for the club, given his contract is due to expire in June. He has been a key player for Klopp, making 201 appearances in central defence and providing a reliable centre-back partner for Virgil van Dijk. An…