When Manchester United come calling, even the league champions know that keeping hold of one of their most-coveted players will be easier said than done. And Sven Jaecques, the CEO of the side who celebrated their first league title in 57 years last season, knows that retaining a midfielder who has compared his highly versatile skillset to that of both Paul Pogba and N’Golo Kante may be beyond the realms of reality. Manchester United are in the market for midfield reinforcements this summer. And what Mandela Kieta may lack in terms of proven Premier League experience or international appeal – …