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Juventus boss Massimiliano Allegri was reportedly left fuming after the club allowed Cristiano Ronaldo to join former club Manchester United last week. 

The Portuguese superstar left Juventus after three years and sealed a return to the Red Devils last Friday in a deal worth £19.4million. 

But Allegri has now been left angry as he is set the task of replacing Ronaldo's goals after an overwhelming transfer window. 

The 54-year old re-joined the Italian side this summer, two years after leaving - replacing Andrea Pirlo following last season's disappointment.

According to Il Giornale, Allegri is 'furious' with club president Andrea Agnelli and sporting director Federico Cherubini.

He reportedly told club hierarchy that 'these were not the agreements' when he accepted a proposal to re-join the club.