Juventus forward Cristiano Ronaldo an injury doubt for Champions League tie?

Juventus forward Cristiano Ronaldo has seemingly emerged as a doubt for the club's Champions League tie with Atletico Madrid next month.

Ronaldo has picked up an ankle knock, and Juventus have revealed that the Portuguese superstar will undergo tests on the injury.

A club statement read: "For CR7, there are tests planned on Wednesday and Thursday on a knock to the left ankle that he suffered during the match with Bologna."

Juventus have two matches scheduled before the second leg of the last-16 encounter with Atletico, including an away game against Napoli in Serie A.

However, it remains to be seen whether Massimiliano Allegri will be prepared to take any risks on the 34-year-old.