Curtis Davies admits being dropped by Aston Villa boss Martin O'Neill earlier this season did 'confuse' him.
Davies was handed a recall to the England squad earlier this month for the friendly in Germany.
That came just a few matches after he was brought back into the Villa fold, after being forced to sit on the sidelines for a number of games.
"It gave me a big lift to get back into the England squad because it wasn't expected," he said.
"I wasn't in the Villa team two weeks ago - I'd only played the three games since coming back when I got the call (from Capello).
"We won at Arsenal which was the massive game I guess because, with Rio Ferdinand, Wes Brown and Ashley Cole being injured, there were a few spaces for defenders in the England squad.
"That result must have made Mr Capello look up and think 'they must have done well to keep a clean sheet at Arsenal'. If that is what got me in, so be it.
"I am just glad to be in the mind of the manager. If I can keep my form up, hopefully I will be involved come the qualifiers in March."
Davies admits it was difficult for him to accept being left out.
"When I was left out of the Villa team a couple of weeks ago it was difficult to take. In the Chelsea game, I wasn't at my best, I'll admit," he said.
"But then we went into the Portsmouth game and kept a clean sheet against Jermain Defoe and Peter Crouch, two England internationals.
"I thought 'at least we are back with a clean sheet' and then in the next game I was left out. I was more confused as to why but the manager will make his decisions and I have to stand by them.
"I managed to get back in for the Uefa Cup game away to Slavia Prague game and we put in a big performance to get a good win at a tough place.
"I've been in the team since. I can only say playing at the moment is good but I need to make sure I stay in the team and all the rest of the England stuff will come together with it."