Arsenal manager Arsene Wenger says they're yet to hit top gear after their thumping win over Newcastle United.

Olivier Giroud and Santi Cazorla both scored twice as the Gunners chalked up a second 4-1 victory in the space of five days to close back up on the top four of the Barclays Premier League.

"In the last six games we have won five, (but) we need a few more wins to completely lift the confidence," said Wenger, who confirmed he expected midfielder Aaron Ramsey to be sidelined for 'a few weeks' with a hamstring injury.

"You could see at some stage we were a bit edgy when it was 3-1 and the crowd as well felt the ghost of Anderlecht here a little bit, so we need a few more games."