The 25-year-old was the subject of four separate bids from Norwich City last month, but the Scottish Premier League champions refused to let him go.
"I am delighted that we have kept all our main players," Lennon told reporters.
"I knew what was happening so it wasn't nervy for me. It might have been for supporters but there was a lot of rubbish and speculation being bandied about, a lot of nonsense, but I suppose that comes with the fun of it all."
Hooper has scored 22 goals in 33 games for Celtic this season.