He was thrown straight into the starting line-up a day after signing for the club but didn't get off to the start he would have liked. He looked hesitant when on the ball and somewhat out of touch with his team mates.
"I was upset with the way the game went. I didn't feel sharp at all, I felt sluggish," Richardson said.
"I hadn't really trained with the team so I didn't know the way they played that well but I've got a break now before the next game and I'll get my fitness up and understand more on how the team play."
The player has moved back to London after stints at Manchester United and Sunderland, which followed his time in the youth setup at West Ham.
After years away from the capital, he revealed that, for family reasons, he was keen to return.
"I'm so pleased. Me and my family are so chuffed to be here.
"I first heard that Fulham were interested in me towards the end of last season, so I've always had it in the back of my mind that I could be coming here.
"Finally, it did happen for me and I want to thank the manager and the chairman. I want to do well for the club and for the fans.
"I've spoken to the manager and we've had a good chat. I'm hoping he'll get the best out of me.
"Saturday was a bad performance but I've put that behind me and I'll be working hard on the training field to prepare for West Bromwich Albion."