two and two comes to five

Hello everyone,

Paul Gascoigne talks: … .php?mov….

And I just wanted to get back playing again. I had to. I had a big move on.
Spurs were making money from us. I had an opportunity in playing abroad.
And that’s all I knew, football, I mean, two and two comes to five.
No, that was all I knew, football.

What does he mean by saying “two and two comes to five”?
Did he want to show that he couldn’t count properly or is it an idiom that implies something else?

Thank you.

It sounds as if he was demonstrating that he knows nothing other than football.

Thank you, Beeesneees.