Lennon added a wreath to the hundreds of floral tributes placed at the site of the crash today.
Chloe Arthur, the teenage daughter of Paisley victim Gary Arthur, 48, is a Celtic and Scottish women's footballer.
Lennon said: "It's an unforeseen tragedy that's affected the whole city, and the city is united in grief at the minute. There's an eerie atmosphere around the place at the minute, which you can understand.
"I was out myself on Friday night with some friends when I heard, so it puts a lot of things in perspective.
"Our own club has been affected indirectly with a young girl who plays with the ladies' team losing her father, so I just wanted to come down on behalf of the club and pay respects to all the people involved.
"It's very difficult for me to find the right words at this time for (the victims and families) but, on behalf of myself and the club and the Celtic support, we're all thinking of you and you're very much in our thoughts and prayers at this time."
Arthur, 18, said following her father's death: "I promise to do you proud."
She wrote on Twitter: ''RIP dad. You'll always mean the world to me. I love you with all my heart."