Real Madrid forward Cristiano Ronaldo says he will not celebrate if he scores against Manchester United.
United will face Madrid in the last 16 of the Champions League at the Bernabeu on 13 February and then at Old Trafford on 5 March following Thursday's draw.
"I won't celebrate if I score," Ronaldo, who spent six years with the Reds, told Spanish newspaper AS.
"It is thanks to Manchester United that I play for Real Madrid. Without them, I wouldn't be the player I am today."
The draw means Ronaldo, 27, will visit Old Trafford for the first time since his £80m move to Spain in June 2009.
Ronaldo joined United from Sporting Lisbon in 2003 and went on to win three Premier League titles, the Champions League, the FA Cup and two League Cups during his spell in England.
"I still speak with [United manager] Sir Alex Ferguson. I miss him a lot, and I miss Manchester United," added Ronaldo.
"I felt very good there, it was like a family. I had six great years there and am still friends with my team-mates."