Juventus overpaid to sign Federico Chiesa from Fiorentina in the summer transfer window, according to Claudio Marchisio.
Juve paid Fiorentina an initial loan fee of €10 million (£9m/$12m) for Chiesa on October 5, with an option to buy for €40 million (£36m/$47m) included in the final agreement between the two clubs.
The 23-year-old rose through the youth ranks at Artemio Franchi Stadium before stepping up to the senior squad in 2016, and went on to score 34 goals in 153 games for La Viola.
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Ten of those efforts came as he helped Fiorentina avoid relegation last season, and Juve were impressed enough to hand him a temporary two-year contract at the Allianz Stadium.