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I have not seen if Juventus spend money on signing new players and maybe they prefer to sign free players at this time because they have spent a lot of money in the transfer market last winter, according to some media that I read, currently Juventus are more dominant in looking for free players or bartering players to cover the position of players who leave,
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it's just a matter of time in my opinion ... historically Juventus buys at least one "noteworthy" player each season even if it has taken players "big names" on a free transfer.
In any case, they made two pretty good shots (Pogba and Di Maria), it's clear that they have a strong interest in returning to the levels of the past years and compete as first actors for Scudetto final win.