Di Matteo delighted as West Brom defeat Fulham
The visitors went ahead early on when Scott Carson pushed Zoltan Gera's shot on to the post, only for it to bounce back against the goalkeeper and over the line.
The result means the Baggies have gone seven games unbeaten in all competitions, and when asked how long he thought the team could keep the run going, Di Matteo said: "I have absolutely no idea.
"We will just try to play game by game, to improve and not concede a goal sometimes for a change! Then we will see at the end of the season where we stand.
"There is no secret - it is just hard work. The players dedicate a lot of their time to the training and transfer it to the pitch on a Saturday.
"We work hard as a team and we enjoy what we do. We try to play football and we believe that is the way to win games. It is quite simple actually.
"To analyse the game today, we didn't concede too many chances to Fulham, we put them under some enormous pressure at times and we created plenty of chances to win the game. We were worthy winners today."