The keeper suffered a ligament strain in the finger in the Champions League opener against Barcelona.
Wenger snubbed Mourinho after Arsenal beat Chelsea 1-0 in Community Shield.
Mertesacker is still struggling with illness, according to the Gunners boss.
Arsenal's 1-0 win over Chelsea in August marked Wenger's first win as a manager over Jose Mourinho.
Cazorla speaks with IBTimes UK ahead of the London derby.
Arsene Wenger accused of dithering in the transfer window in the absence of David Dein.
Jose Mourinho says both players will be absent for the visit of the Arsene Wenger's side.
Jamie Carragher wants Liverpool to build on their recent displays against Stoke and AFC Bournemouth.
Liverpool won 1-0 at Anfield thanks to a controversial goal from new signing Benteke.
Join IBTimes UK for live coverage as the Cherries visit Anfield for the first time in 47 years.
Liverpool face AFC Bournemouth in the Premier League clash on Monday. Find out how to follow the match live in the UK.
Eddie Howe says his team are ready for the challenge, and will not veer away from their attacking style.
IBTimes UK sports editor Nick Howson and sports reporter Tony Mogan ponder which sides are up for the drop this year.
Club legend faces his toughest test yet in Cherries' first ever top flight campaign.
Howe will have a real challenge next season and purchasing the right players could make all the difference.
Henry enjoyed success at Arsenal, Barcelona and Juventus to name a few high-profile clubs
The BBC's Price of Football study reveals the price increase across football
Pele is a partner in 10Ten Talent
Usmanov's Mail.ru has purchased Russia's VKontakte social platform
The World Cup boosted Puma sales, but they were down overall.
Arsenal fans can't quite believe it, but their club has completed a summer transfer with confidence.
Liverpool may have to increase bid above £20 million to land Adam Lallana - Report