Lampard has struggled to make an impact in Carlo Ancelotti's new diamond formation, but Keown told the London Evening Standard: "Frank was a quiet individual when he first broke through into the England squad but you could detect that inner belief and focus before that game against Belgium and he still has that focus in his character now.
"Sometimes he takes note of things that are said in the press or what people are saying but he has a tough exterior. He knows he is playing well and we are just talking about very fine margins.
"People are making an issue over his lack of goals. He has such a great record, so now he has fallen below his standards everyone starts to question it but I don't think it's a problem.
"It's true that he is at his best when he is arriving later in the penalty area. In his current role he is starting a bit higher up the pitch for Chelsea and that element of surprise is lost. Defenders are finding it easier to pick him up than when he is coming from deep and drifting into space.