The Gunners have not kept a clean sheet in the Premier League since the opening day of the season, conceding 11 goals in their last six league outings, but racked up an easy 4-0 win against Standard.
That match saw full-backs Kieran Tierney and Hector Bellerin both come into the starting XI after their injury lay-offs, while Rob Holding lined up at centre-back.
Keown believes the trio have added fresh – and much-needed – competition in the Arsenal back-line, though only Tierney should slot straight into the first-choice defence as things stand.
‘I think Tierney comes in,’ said the former Arsenal defender on BT Sport after witnessing his old club’s comprehensive victory.
‘I think Sokratis plays and David Luiz, I’m not going to argue, but Holding has a chance to break up that partnership.
‘He’s good enough to do it and he’s coming back from injury.
‘Bellerin can break in but Calum Chambers looks a different player more recently. I think Ainsley Maitland-Niles now has lost that place.
‘Chambers I think is in control, I didn’t see enough from Bellerin tonight.
‘I think it’ll be the back four who played against Manchester United but Tierney could play.’
Arsenal, who currently sit in fourth place in the Premier League table, are next in action on Sunday afternoon against Bournemouth – the last match before the international break.