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Cech has come in for some criticism this season for his performances and there has been speculation Arsenal could look to replace the 34-year-old in the summer.
England number one Joe Hart, currently on loan at Torino from Manchester City after being ruthlessly discarded by Pep Guardiola, is being talked about as his potential successor at the Emirates.
But, asked if he would want Hart over Cech, former Gunners goalkeeper Lehmann responded: "No, I wouldn't.