If David Moyes is sacked tomorrow, most people's immediate favourite for the United job would be the likable and charismatic Jurgen Klopp of Borussia Dortmund. Klopp has worked wonders at Dortmund, transforming the Germans from also-rans to title winners when he guided them to their first Bundesliga crown since 2002 in 2010-11, with Dortmund even retaining their title the following season. That's no mean feat given the monopoly Bayern Munich have on German football, but - and to use a Sir Alex Ferguson phrase - he knocked them off their perch. Unfortunately, times have since changed and Bayern are back in a big way, reclaiming their Bundesliga title last season by a record points tally to go alongside their Champions League, UEFA Super Cup and DFB-Pokal successes that term. Dortmund are also in the process of being stripped of all their best players - Mario Götze famously left for Bayern at the end of last season and Robert Lewandowski will do the same next summer - the club's lack of ambition in that they've become a 'selling club' could lead to Klopp's departure. Shinji Kagawa also left - for United last summer - could Old Trafford be about to receive another Dortmund import? Should David Moyes be sacked and if so, who should replace him? Let us know in the comment section, below.