Roberts, who is an 18-year-old winger, has joined Celtic on an 18-month loan deal from Manchester City.
Griffiths seems happy to have the youngster as his teammate, and is looking forward to playing with him against Aberdeen away from home at the Pittodrie Stadium in the Scottish Premiership on Wednesday evening.
Welcome to Celtic @patrick7roberts . Let's hit the ground running in Wednesday.— leigh griffiths (@Leighgriff09) February 1, 2016
Roberts is a talented young player, and he should prove to be a good signing for Celtic. The England Under-19 international, though, will need some time to get to know and understand his teammates.
Celtic are likely to win the Scottish Premiership title this season, which means that Roberts has probably been recruited in order to help them progress to the group stage of the Champions League.
Under manager Ronny Deila, the Bhoys have not gone past the qualifiers for the past two seasons.