The 24 year old scored nine goals in 32 matches last season, and has started this term with two in six games, notably grabbing Bolton's first goal in Europe on Thursday.
"The reason why I'm playing so well is because I'm very happy at Bolton," said the former Lens player. "Sam has given me a lot of confidence, as has the rest of the team and the supporters, and it means that every time I go out on the pitch, I give my best.
"The club also stood by me through a very difficult time in my career and that helped."
Diouf said: "That was a great moment for me, for the team and the fans, and a very important win for us.
"We know playing away will be difficult, so it was important we won the game.
"But I'm not happy with myself and the team because we didn't play well in the first half, and we will need to improve in the second leg if we are to finish them off.
"In the first half we were waiting all the time for something to happen, but then in the second half we decided to go out and play football and go forward.
"This is the Uefa Cup, and in this competition you don't think about anything but pushing forward and scoring a lot of goals."
Meanwhile, Jared Borgetti has promised more goals after his first of the season last Thursday against Lokomotiv Plovdiv.
"I'm delighted to have scored my first goal for the club, but I've been expecting it.
"I've been wanting to score to prove the manager's confidence in me, and for all the people who believed in me before I came here.
"I know I have to score in the Premier League because that is where you prove yourself as a striker, but this is the first of many goals for me.
"I know my role. I'm a goalscorer, that's my nature, and although this is only my first goal, I know I have to score more.
"I feel that by playing more and more, I know I can prove myself."