Although the transfer has not, as has been reported, been totally finalised at West Ham, the player has completed his paperwork with the French club, and no hitches are anticipated.
Of the deal, Glenn says: "It is an undisclosed fee, but we have secured a small amount of money for him.
"It is not a large amount, though, and with the way the transfer market is at the moment, we have had to take a hit on what we paid Liverpool for him.
"But it is the right move for the player and the club. He was not getting regular football here because, after we signed Tomas Repka, it came down to him or Christian Dailly to play alongside him.
"Christian had an excellent season, and of course at right back Sebastien Schemmel was player of the year.
"But I hope Rigobert does well at Lens, where he will be involved in the Champions' League.
"He is captain of his country Cameroon, where he is a superstar, and could not expect to be sitting on the bench every week - he needs to be playing regularly."
Glenn says Rigobert, who spent half of last season at German side Cologne on loan, was a pleasure to work with, adding: "I liked him as a human being, and he always gave his all in training and games."
MD Paul Aldridge adds: "We'd like to thank Rigobert for his services and wish him all the best when he joins Lens."
Rigo, who had two years left on his Hammers contract, has signed a four year deal with the French club.