Vueling look to be adding MAN-BCN, as the option has appeared on the vueling site in the past few hours, but no flights bookable yet.
Given no footy fixtures have been announced, we can discount any charter flights for that.
Looks like the BCN route is about to get busy! I suppose with Ryanair, Monarch and Jet2 flying into one of Vuelings main bases, it was only a matter of time before they reacted.