Fossati coached Cambiaso at Albissola and was asked if his inconsistency this term is due to seeing a move to Manchester City blocked last year.
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But he told TuttoJuve: "I think Andrea went through a period of decline and I don't think it's linked to that summer situation.
"Furthermore, I'd like to point out that it coincided with a lacklustre period for several players (at Juve) ...
"I mean, his slump coincided with the team's. It's not just him who's declined, and certainly the start of the season wasn't as devastating as other seasons."