"It was the last solution. We only had nine men on the pitch and although it wasn't normal for a goalkeeper to play as a midfielder, I had to do it," Reina told the club's official website.
"Rafa asked if I would mind going on to help the team and I told him it was no problem for me. Did I enjoy it? I don't know - it was more difficult than I thought it would be.
"I never realised just how much the outfield players have to run around in an actual match. This was only a friendly match so I can imagine there's even more running around in a really important game.
"I had a great chance to score what could have been the winner at the time and I should have hit the target. I think the defenders hassling me before I could shoot put me off. You have to remember that I'm a 'keeper and not a striker! My other attempt though wasn't a shot though – it was a really good pass!
"In training I sometimes play outfield but it is very different in an actual match and now I understand how difficult it is to score a goal. It was good fun having the chance to experience playing as an outfield player but I'm looking forward to getting back in goal soon."