Brendan Rodgers was confirmed as the new Celtic boss on Friday.
The former Liverpool boss was confirmed as the new Celtic manager on Friday, with Ronny Deila departing the club this year.
The move has been widely regarded as something of a coup by Celtic, with it believed that Rodgers has turned down potential interest in the Premier League to make the move to Scotland.
Beattie played under Rodgers during their time at Swansea, where Rodgers enjoyed a promotion winning campaign from the Championship into the Premier League.
And he insists that the Northern Irishman is the best manager he has worked under, adding that the Hoops have pulled off a coup in securing his signature.
"As big as Celtic are, I think it is a massive coup getting Brendan Rodgers," he told the Scottish Herald.
“It shows you the ambition he has got that he wanted to get back in and manage at a big club and it really is a wonderful signing. Without a doubt he is the best manager I have worked with.”
There is no denying that Celtic fans are happy with Rodgers appointment, as they reacted with widespread praise for the move.
They will now be hoping that he can continue their dominance of the Scottish Championship, with it set to be tested by Rangers’ return next year.
Their main focus will be on the Champions League though, with them desperate to return to that competition having missed out for the last two years under Deila.