To cover that hypothetical, this article grades Enyeama's performance against Iran at the 2014 FIFA World Cup and provides a scouting report on his season for Lille.
Enyeama vs. Iran Grade: B
Nigeria's brand of football was boring, dull, lifeless and uninspiring in a 0-0 draw against Iran.
Nigerian national team manager Stephen Keshi set his side up to avoid losing, and Enyeama was a big reason why that objective was accomplished.
Enyeama commanded his box, claiming three crosses.
Denying Iranian centre-forward Reza Ghoochannejhad with a reflex save was the game-changing moment.
Big ups to Enyeama for keeping a clean sheet. But, Nigeria, that was a terrible performance from us.— Banky Wellington (@BankyW) June 16, 2014
The reason why Enyeama did not receive a higher grade was inactivity.
He was not required to make saves, as Iran were content with a draw.
Arsenal Signing Enyeama: Positives
Enyeama is statistically superior to current Arsenal goalkeeper Wojciech Szczesny.
21 - No goalkeeper kept more clean sheets in the top five European leagues in 2013/14 than Nigeria’s Vincent Enyeama (21, for Lille). Wall— OptaJose (@OptaJose) June 16, 2014
|League Only||Vincent Enyeama||Wojciech Szczesny|
|Saves Per Game||2.9||3.1|
|Saves Per Goal Conceded||4.2||2.8|
 blocks included.
Enyeama had a world-class season for Lille, which was justified by his inclusion in L'Equipe's Team of the Season.
L'équipe type de la saison en Ligue 1 pic.twitter.com/4x6RMTVJyt— L'ÉQUIPE (@lequipe) May 19, 2014
Enyeama had continued his extraordinary form, having been named in the best XI by L'Equipe at the halfway point of last season.
L'équipe type de Ligue 1 de la phase aller pic.twitter.com/pfO3lCFRUq— L'ÉQUIPE (@lequipe) December 24, 2013
Enyeama made a series of remarkable saves for Lille.
Enyeama darts across his line to save Marseille centre-forward Andre-Pierre Gignac's fierce volley.
From the penalty spot, Enyeama anticipates the direction of Montpellier central attacking midfielder Remy Cabella's spot-kick and saves it.
Scampering back, Enyeama vaults up to tip over Toulouse right wing-back Serge Aurier's chip shot.
Moving forward, Enyeama charges out to block the shot of Guingamp centre-forward Mustapha Yatabare.
Same result when the ball fell into the path of Rennes central midfielder Abdoulaye Doucoure.
Like Olusoji Fasuba sprinting out of the blocks, Enyeama closes down Doucoure's shooting angle and blocks the shot with his shin.
Arsenal Signing Enyeama: Negatives
Enyeama is not indomitable and did have substandard moments.
He palms Nice centre-back Mathieu Bodmer's innocuous backheel kick into the back of the net.
Enyeama is caught in no man's land, allowing Roma's Ajaccio loanee Gadji Tallo to lob the ball into an unguarded net.
If Arsenal manager Arsene Wenger is searching for a cost-effective goalkeeper, then Enyeama is not his man.
Enyeama extended his contract at Lille until 2017.
Reminder: Lille's Nigerian goalkeeper Vincent Enyeama has signed a new contract to stay at the French club until the summer of June 2017.— Oluwashina Okeleji (@oluwashina) December 10, 2013
"I just want to continue to help the team in goals this season, but also in those that follow," Enyeama said, per Lille's official website (h/t FourFourTwo). "I'm really happy to be part of this team and very happy to have signed this contract extension."
Lille will not feel compelled to sell Enyeama unless a significant transfer bid is lodged.
Enyeama is a seasoned professional with over a decade of international football experience.
He is in career-best form and made a crucial save against Iran.
With no quality backup to push Szczesny, Wenger should consider signing Enyeama in the summer transfer window.
Statistics via WhoScored.com