After Gary Hooper had opened the scoring for the visitors a mistake by Buddies keeper Craig Samson allowed the 24-year-old Nigerian defender to notch for the first time since joining the Hoops in the summer and then thrilled the travelling fans with a series of back flips.
The Celtic boss said: "My heart was in my mouth - I had never seen him do it before. If he had landed on his neck he could have been in trouble but he has been a huge asset."
Midfielder Victor Wanyama grabbed a double before the break and striker Tony Watt scored with four minutes remaining to seal a victory which thrilled the Celtic boss ahead of their Champions League Group G clash with Barcelona on Tuesday night.
He added: "He has had a brilliant introduction. Him and Wanyama were excellent and they will be very important on Tuesday.
"Technically, Wanyama is excellent, his all-round game is of a very high order at the minute. We have good athletes who can play football and I guess that is what you need in the modern game"
Indeed, a delighted Lennon was in the mood to lavish praise on all his players, and he said: "Hooper, for me, is a great player. He is playing probably at his peak, not only does he score goals but his all-round play and intelligence is of a very high quality now.
"I am starting to run out of things to say about the boy but I just hope he takes that form into the game on Tuesday. I thought Tony Watt was fantastic as well, I really did.
"He was hungry, he is a wee bit raw but he has so many good attributes that he is a defenders' nightmare. He just wants to keep running them and wearing them down and I am delighted he got his goal.
"Lassad did really well, he is training well and starting to get used to the pace of the game here. We have good options now. With Joe Ledley and Beram Kayal back, the squad is looking very strong and vibrant."
Source: PA
Source: PA