The main focus, of course, was on the left foot shot he rolled over the line after he casually rounded Tony Adams and David Seaman in the 37th minute.
TV replays showed the ball was over the line by its own circumference before Ashley Cole cleared, but Steve Dunn waved play on after looking across at his linesman, and Fredi says: "I really thought it was a goal, but they refused it, and I didn't celebrate because I wasn't 100% sure. I didn't speak to Ashley Cole about it after - it is finished now.
"But I definitely think it would have changed the game because 1-0 up would have been better for our mind and concentration, and we would have been more motivated."
Fredi, who returned to the side after illness to replace Jermain Defoe, says he should have also scored when, after again beating Adams, who looked disturbed by his presence for much of the game, he half volleyed over.
"It was unlucky," he says, "but it was my fault this time because I missed. I am disappointed because against such a team we can't miss that kind of goal.
"It hurts, but it was very hard against a very good team, and we defended successfully for over 70 minutes - but with such players you can't keep the score like that for long."
Fredi played on his own up front, but has no complaints, and adds: "It was the game plan and I had to deal with it - we prepared it that way."
Now he is determined to make amends at Newcastle on Saturday as West Ham look to complete what can be their only double of the season following the 3-0 win over the Geordies at Upton Park.
"We have to start again and be focused for it, then it will be all right - we have to finish well in the last two game after the disappointment of losing at Arsenal," he stresses.