The Hoops look a side reborn under Brendan Rodgers, with Brown back to his best in the centre of the park.
Rangers defender Rob Kiernan has been named in Chris Sutton's Team of the Week.
Tom Rogic scored for Celtic against Motherwell in the Scottish Premiership on Sunday.
Two points, no wins and just four goals; so why is Armstrong so positive about Celtic's European campaign?
Celtic are cruising at the top of the Scottish Premiership table under Rodgers.
The Celtic midfielder admits he should have scored.
Brendan Rodgers’s Celtic will face Scottish Premiership rivals Aberdeen in the Scottish League Cup final on Sunday.
Celtic are currently bottom of Group C having failed to win any of their five games.
Steven Thompson has hailed Celtic midfielder Stuart Armstrong.
Stuart Armstrong joined Celtic from Dundee United in February 2015.