The Portugal youngster - who scored for the Under 21s against Macedonia on Tuesday - cost United £7.4million in the summer.
Despite being well away from breaking into the first team, Bebe was an inclusion in Sir Alex Ferguson's plans for Europe.
Net gains: Bebe celebrates his goal for the Portugal Under 21s
The striker said: 'I'm surprised by my inclusion in the Champions League squad. It's a dream for me. I never thought I would have made it, but now I am a very happy man.
'I only hope that my confidence returns when I start playing some games and scoring goals, like I know how.
'At the moment I am working very hard each day in training. I intend to make the most of my chance and hopefully profit from the opportunity given to me.'
Manchester United name new recruit Bebe in Champions League squadFerguson must wait for Bebe to blossom after indifferent U21 showingMANCHESTER UNITED FC