The 25-year-old has five assists and three goals to his name so far, but his general play on the right-wing for Spurs has earned rave reviews so far this season, and Parker is one of those impressed.
Following his move from Leeds United as a teenager, Lennon was tipped for big things and won a number of England caps before inconsistent form and injuries took their toll, but Parker believes he is once again hitting top form.
Speaking to reporters, he said: "Is this the best he's ever played? Yes, I think that's fair.
“Over the last four or five weeks he's been unplayable really. He was at a different level [against Reading], not just because of his raw pace and his threat on and around the ball, but his work-rate was something very special.
"I couldn't think of anything worse if I was a full-back than having him running at me - and I'm sure every full-back out there has the same feeling. He deserves a special mention, he has been brilliant.”
In recent years the winger attracted criticism for his inability to consistently produce quality on his final ball, but Parker believes those problems are behind, adding that he could have had several assists against Reading had other players been better placed.
He continued: "You can see that he's been working hard on his final ball, with the amount of times he gets to that by-line - and he set up the goal yesterday.
“He probably could have set up another couple if they had fallen for the right people. He has certainly added that to his game, which is pleasing.
"Everyone knows what qualities we have out wide, and [Gareth] Bale and Azza [Lennon] have been at the top of that. I think Gareth is a fantastic player and sometimes he gets all the headlines, but Azza has been key to that as well."