Arsenal's next game comes against Everton in the Premier League however, Arsenal new boy Aubameyang may have to wait to make his Gunners debut after being diagnosed with a sickness bug.
After Olivier Giroud arrived at the Liberty Stadium just hours before his projected move to Chelsea on transfer deadline day, Arsenal showed they'll need more than Henrikh Mkhitaryan and Pierre-Emerick Aubameyang in the January transfer window if they are to secure a top-four spot this season. The Armenian showed a couple of nice touches but the gaps in Arsenal's defence and vulnerabilities down the flanks were never going to be solved with the addition of one world-class attacking acquisition.
"He's an example for us strikers because he was fast and scored a lot of goals", Aubameyang said.
Having lifted the PremierLeague trophy last season, the Blues are once again ahead of the Gunners in the standings with eight points and three places separating the sides.
Sanchez did, of course, end up in Manchester - just not the half everyone had thought.
Olivier Giroud has completed his move to Chelsea from Arsenal, which has allowed Michy Batshuayi to join Borussia Dortmund.
"But the first reason is the sporting challenge, that has always been my first priority".
"The Champions League is massive for a football player", said Giroud, who joined Arsenal in 2012.
The 31-year-old was in the stands for the disappointing 3-0 loss to Bournemouth and could see plenty of action in the coming weeks, with Alvaro Morata sidelined by a back injury.
Gunners fans will be hoping Mkhitaryan's reunion with former team-mate Aubameyang suits their new colours. With Giroud only featuring sporadically for Arsene Wenger, Henry finds no fault in his compatriot's decision to go to Chelsea.
With his team embroiled in a relegation battle, head coach Alan Pardew hopes the England forward - hungry for goals in a World Cup year - will prove a big hit.