According to the portal fichajes.com Juventus is fourth European club for expenses on the market between summer and winter session. In the site does not appear the metrics, in all cases from this analysis Juventus would be right behind Paris Saint Germain, Chelsea and Manchester City. 

The stadium has allowed big investment, for next year will only serve targeted investments. 1. Paris Saint Germain, 106.5 M € 2. Chelsea, 103 M € 3. Manchester City, 95 M € 4. Juventus, 92.5 M € 5. Rome, 83.5 M € 6. Atlético de Madrid, 69.5 M € 7. Anzhi, 67 M € 8. Liverpool, 65.5 M € 9. Arsenal, 62 M € 10. Napoli, 61 M €

source:tuttojuve.com adapted by: Mike Prise