Juventus sacked coach Massimiliano Allegri over his behaviour during and after this week’s Coppa Italia final in which he was sent off, the Italian Serie A club said on Friday. Juventus beat Atalanta 1-0 to win a record-extending 15th Coppa Italia on Wednesday, its first trophy in three years. “Juventus announces that it has relieved Massimiliano Allegri of his position …