Prior to his strike against the Foxes, his form this season has been poor, with a back injury unsettling his season and leading to a 13-game drought that has also seen him dropped by Spain.
However, Forssell, himself a former Chelsea striker, believes the striker's critics will soon forget his dry spell, provided he can continue scoring.
"Of course it is psychologically tough not to score," Forssell told Goal. "A high price has been paid to acquire him and he knows it. But the beauty of football and being a striker is that when you eventually score the next goal, all is forgiven and people forget that he has ever had a dry patch at Chelsea.
"I think for Antonio Conte, it is about having the eye to sense who is in form and who needs time to sort their form out. Sometimes it is about letting strikers play even though they are not scoring, and for the player to sense the faith of the gaffer that will finally end up with the scoring of goals.
"Sometimes its about taking a striker out of the pressure to allow him gain focus and form. Also, sometimes its easier to score from the bench as there are no expectations towards that player.
"I think all of us strikers go through a dry patch. Generally, he can be happy with his first season in the Premier League as it is very different to any of the leagues he has played in before. It's all about staying focused and working hard in training. It starts from there and eventually reflects on to the games.
"I am not worried. We have all seen him score amazing goals both abroad and in the Premier League. It's also about the team feeding and finding him correctly on the pitch. He is a great striker and I believe he is a great player for Chelsea."
Forssell made just over 50 appearances for Chelsea as he started out his career and he was involved as the club won their first title for 50 years under Jose Mourinho in 2004.
He went on to play for Borussia Mönchengladbach, Birmingham City and Hannover and last season the 37-year-old scored eight goals in eight games for HIFK Fotboll in his native Finland. Forssell continues to watch Chelsea and gave his thoughts on Eden Hazard's recent appearances as a false nine.
"He is definitely not as bad as what some people are saying," He added. "It takes time to adapt and to be honest, you put Hazard anywhere on the pitch and he will do a great job. He is so good on the ball and generally drops deeper to get the ball no matter where he plays."