Boyata joined Scottish Premiership Celtic on a four-year contract from Premier League giants Manchester City earlier this month.
Armstrong, who himself moved to the Bhoys from Dundee United in the January transfer window, has revealed that he is doing all he can help the Belgium international defender settle in at Celtic Park.
The 23-year-old Scottish midfielder has also made a joke about Boyata yet to give him petrol money for hitching a lift to pre-season training.
"He's a very good guy,” Armstrong told The Scottish Sun. “I’ve been giving him a lift in and out and he's still not produced any money for it yet.
"But I'm sure he will. He's a very nice guy, he's very chatty. It's good because we know what it's like to be a new player. So being friends with him and the boys is excellent as well.”
Armstrong’s comments give a glimpse into the strong team spirit and bond among the Celtic fans.
This is a sign that the players are working as a team, which they need to if they want to progress to the group stage of the Champions League in the upcoming 2015-16 season.
Pre-season training has already started for the Bhoys, who will commence playing competitive games from next month.