The Arsenal boss remained unconvinced and admitted during the transfer window that he had not decided whether to seek a similar loan move for Wilshere, whose contract expires next summer.But Wilshere stayed and, having returned to full training following a fractured leg suffered towards the end of his time with Bournemouth, the England worldwide is now expected to come back into the Arsenal side.
Sanchez was named on the bench for Arsenal's routine 3-0 win over Bournemouth on Saturday after starting the previous match at Liverpool.
The Gunners failed to qualify for the Champions League for the first time in the Frenchman's 20-year reign after finishing outside the top four in the Premier League last season. He's doing well in training, getting stronger and stronger each day.
Attack: Mesut Ozil, Alexandre Lacazette and Danny Welbeck all sat out training today which is a big indication they won't be involved tomorrow so we should see plenty of changes up front.
Francis Coquelin will not be involved however after suffering a hamstring injury during his cameo appearance against the Cherries, with the Frenchman ruled out for three weeks which is likely to see him side-lined until the global break in October.
Arsene Wenger was prepared to allow the 25-year-old, who spent last season on loan at Bournemouth, leave, while Wilshere is understood to have assessed his options.
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Alexis Sanchez is expected to play some part, as is midfielder Jack Wilshere.
LONDON, ENGLAND - AUGUST 21: Jack Wilshere of Arsenal in action during the Premier League 2 match between Arsenal v Manchester City at Emirates Stadium on August 21, 2017 in London, England.
"It is a good opportunity to show we can cope", Wenger said.
Arsenal are making their debut in the UEFA Europa League group stage, having missed out on Champions League qualification for the first time under Arsene Wenger.
The match against Koln, though, is a tricky opening outing, with several of Wenger's first-team players set to be rested, with one eye on the weekend's clash against Chelsea. In three days you can recover'.