The Chilean, who could be set for an imminent move to Manchester United, was left out of Arsenal's trip to the south coast by Wenger and was sorely missed as the Gunners' imploded after Hector Bellerin opened the scoring in the first half.
"Will he go or not, I don't know, but at the moment it's the transfer period".
Aaron Ramsey and Saed Kolasinac are fit again for Arsenal but Mesut Ozil is a major doubt.
Arsenal travelled to Bournemouth today to face a team that was hovering above the relegation zone and hadn't won for ten games, but then again Arsenal hadn't won any of their last five either and they had an terrible away record.
Arsenal player ratings: Cech and co absolutely shocking against Bournemouth
A ball over the top found substitute Lys Mousset who was then able to tee up Ibe as he fired under Cech and made it 2-1. The first half was summed up from an attacking point of view for Arsenal by Ainsley Maitland-Niles going closest.
The Gunners are now in sixth place in the Premier League table as they chase Champions League qualification this season. It was a lack of the right decision-making.
Even the 68th minute dismissal of Leicester defender Ben Chilwell for two bookings in quick succession couldn't lift lethargic Chelsea, which was outplayed in the first half and couldn't make its numerical advantage count at the end of the second period.
"If players like Sanchez go we have of course to respond". Both of the hosts' goals came from some pretty suspect defending, with Rob Holding and Granit Xhaka failing to keep Bournemouth at bay for the second.
Alex Iwobi tested home keeper Asmir Begovic before Bournemouth midfielder Dan Gosling was booked after going to ground under a Shkodran Mustafi challenge when the Arsenal player appeared to have caught him. Have we seen the last of him in an Arsenal shirt?
"I don't master the rhythm of that but it could happen today, tomorrow, or not at all". I saw Eden (Hazard) was very exhausted so he came off.
"We haven't created enough with the possession we had".