Cesc Fabregas could well have been an Arsenal player this season - but Wenger turned down the chance to sign him because he already had too many midfielders.
That's according to Fabregas himself, who says the presence of Mesut Ozil, Jack Wilshere and Santi Cazorla meant there was no room for him at the Emirates Stadium.
It was claimed that Arsenal had a buy-back option on Fabregas but turned down the chance to sign the former fan favourite, instead opting to spend their cash on the likes of Alexis Sanchez and Danny Welbeck instead.
It seems that may have been the wrong decision - Fabregas so far has seven assists in seven Premier League games, helping Chelsea to the top of the table. The 27-year-old has confirmed that Arsenal were never in for him because of the options they have in his position.
He told Spanish radio station COPE: "Wenger was already covered with Ozil, Cazorla and Wilshere, and so I was less needed [to fill a midfield] position, so I decided to go to Chelsea. Arsenal had an option, but they told me there had similar players in my position."
Fabregas also revealed that he had offers from two other unnamed Premier League clubs.
Arsene Wenger may well be ruing that decision but at least he can call upon Wilshere, who claims to be back to his very best following a spate of injuries.
After a frustrating few seasons he's started five of Arsenal's seven Premier League fixtures so far this term. The England international believes he is finally up and running after a slow start to the campaign, and is eager to make up for lost time.
"I feel good and I'm always looking to improve, no matter what,' Wilshere told Arsenal's official website.
"For a player of my age, I've missed a lot of football so I'm just trying to play as much as I can, train as much as I can and I've always said that when I get fully fit you'll see the best of me.
'I said at the start of the season that it was going to take some time to get back to my best.
'Ever since my first injury, it's always taken a run of games - probably between five and 10 - to get back to my best.
And finally Arsenal appear to have one eye on the January transfer market, and according to reports they've agreed terms with Real Madrid midfielder Sami Khedira.