Lennon has been linked with a switch to Everton, following news of the impending departure of David Moyes to Manchester United.
But Wanyama believes his boss still has plenty to offer the Hoops.
"For me, he has been great," he said. "I've learned a lot from him. He has put a strong team out there and he is still a very important manager for us.
"I would say he is one of the best managers I have had in my career. We have learned a lot and we have achieved a lot while I have been here. We are delighted to have him.
"There is no doubt other clubs want him. We all just want to see him stay here."
The Kenyan is also keen to see the current crop of players remain together heading into the 2013/14 campaign.
He added: "I know it's going to be difficult but, if it can happen, it would be great. In football, sometimes players go but I believe everything will be fine."