Jose Mourinho has become the first manager in football history to take his career transfer spending past £1billion- and passed that landmark during the current window when he signed Romelu Lukaku.

Analysis of the Manchester United manager’s all-time spending shows he has now spent just over £1.1bn in 17 years as a boss.

Pep Guardiola, Mourinho’s nemesis in Spain and current cross-city rival in Manchester, has spent £859m, in a little over half the time.

Current Manchester United boss Jose Mourinho has spent £1.1bn in 17 years as a manager

Our calculations took the pound sterling values at the time of each transaction into account for consistency.

Mourinho and Guardiola are both considered among the all-time great managers - though both have had massive resources to play with for much of their managerial careers.

The only other manager who comes close to their spending is Bayern Munich manager Carlo Ancelotti, with Chelsea one of nine clubs he has managed in 22 years, spending £970m gross to date.