straight to your inboxManchester United have a potential dilemma on their hands this summer, as Chelsea look to rebuild ahead of a return to the top of English football.The Londoners have already secured the signatures of Timo Werner and Hakim Ziyech, and they are also linked with Kai Havertz and Leicester's Ben Chilwell.Those names are almost certain to drastically improve the fortunes of the Blues on the pitch, yet the same question continues to be asked - what about the defence?Frank