Leonardo Bonucci has suffered an ankle injury, Serie A champions Juventus have confirmed.
The defender started Sunday's 2-1 win at Lazio but had to be replaced before half-time, having tried to play on after being hurt early in the game.
Juve announced in a medical update on Monday that Bonucci has sprained his right ankle and reports have claimed he could be out of action for as long as a month.
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The Italy international has already begun treatment for the injury, but is now a doubt for the first leg of Juve's last-16 Champions League tie with Atletico Madrid on February 20.