The Sun (yeah I know), are running a story that we haven't actually made a bid for Mbappe - perhaps it was one of AW's 'enquiries' to see if he was available like he did a few years ago re Gotze & Hazard for 35m.
Just another thought - if we are prepared to enquire / bid on a raw talent on a break out season for 87m, then If that bid wasn't successful I'd expect to see similar bids for players of similar stature / quality - Morata, Bellotti, Icardi, Griezmann, Aubameyang, James, Isco etc. IIRC Bellotti's release clause is 85m.