"It's fine, I'm 100%," Owen told BBC Radio Stoke. "I've had the all-clear from the specialist this week.
"The bone's back to normal. I have to wear the mask as a precaution, but it doesn't limit my performance."
Chelsea were drawn against Barcelona in one of the standout ties of the Champions League last 16.
Premier League champions Chelsea have been drawn to face Barcelona in the Champions League last-16.