Cech is all set to face his former club Chelsea on Sunday with his transfer from Stamford Bridge to the Emirates still fresh in the mind of supporters and observers alike.
His impact upon arrival has been evident as the Gunners’ defensive organisation, solidarity and overall confidence has improved gradually as the season has gone on.
Bringing Cech to the club when he was available was seemingly a no-brainer, yet for Wenger it was ultimately a decision which was extremely tough due to his opinion of David Ospina.
"It was a very, very difficult decision for me, because I rate highly Ospina. I have a high opinion of him. Ospina is a keeper who, in my opinion, is underrated — especially in England,” Wenger told the Mirror.
"But (signing Cech) was maybe one of the few opportunities to say, 'Okay, this is an obvious (transfer).' It was more to say, 'If I don't do this, it would be a mistake.’
"You know one thing — you need a top-class goalkeeper. I have said many times that it is an underrated position. And you need a top-class goalkeeper to do well.”
Ospina broke in to the Arsenal first-team eleven ahead of Wojciech Szczesny for the latter stages of last season and by all accounts acquainted himself well, performing and keeping clean sheets.
However, Cech’s experience as a winner both in the Premier League and the Champions League meant signing him was an opportunity too good to miss regardless of Ospina’s performances.
After a slow start, the tough decision has paid off as Cech’s presence coincides with Arsenal’s superb defensive record allowing them to head in to the clash with Chelsea topping the Premier League table.