The Englishman beat Charlie Shaw's record of 11 consecutive league shut-outs with his clean sheet in Sunday's 1-0 win over St Mirren.
Forster has been in superb form for Lennon's side in both domestic and European competition in recent years and is likely to be the subject of Premiership interest come the end of the campaign.
After making huge strides under the watchful eye of Parkhead goalie guru Stevie Woods, a spot in England's World Cup finals squad this year remains a target for Forster.
And Lennon reckons his No.1 deserves his place alongside the legends of Hoops history.
He said: "His level of concentration is amazing, and when you add that to his ability, and talent, I think he is one of the best goalies we've had here at Celtic, ever.
"And for him to break the club record, which has been long-standing, is fantastic for him and the team as well.
"He's only been here two or three years, but what he's achieved in that time has been absolutely incredible really and long may it continue.
"The work he does with goalkeeping coach Stevie Woods is fantastic, they have a great relationship and Fraser would be the first to say what an influence Woodsy has had on him. It's all about the individual and he sacrifices a lot.
"He's one of these players who works incredibly hard on his game day in day out an he's getting all the rewards for that at the minute."