There's been talk his France teammate has found settling at Barca difficult after his €120m move from Atletico Madrid.
But Lenglet said, "We're laughing all day long.
"He loves making jokes and he's not changed at Barcelona. We all have to understand the change of position he's made.
"At Barça, he's evolved to even playing on the wing. He works really hard for the team and helps us with his talent and sacrifice. For me, there's no Griezmann issue."
On Ousmane Dembele, he added: "If he has the necessary continuity, I think he has all the necessary quality to return to the France squad. He'd prepared brilliantly, but then he got injured again.
"Now he's got the red card, which also put the breaks on. He is a player with huge amounts of talent, but he needs more continuity to be at his best."