By Tom Victor As Liverpool prepare to take on Manchester United in the FA Cup on Sunday, there’s plenty happening off the pitch as well as on it. Questions continue to be asked of Jurgen Klopp’s successor after the manager brings his reign to an end at the end of the season. Xabi Alonso is one of the men in the mix, and his Bayer Leverkusen side have been kept apart from Liverpool in the quarter-finals and semi-finals of the Europa League. On the pitch, that cup trip to Old Trafford is a chance for Klopp’s team to ensure a quadruple is still possible as their players prepare to set off for the…