Lehmann Rejects Khawaja's Ball-Tampering Claims, Says 'Paid a Heavy Price' - Former Australian head coach Darren Lehmann has strongly refuted Usman Khawaja’s assertion that the entire Australian team knew about ... Get Latest News on Other Sports only on lokmattimes.com. Lehmann, speaking ahead of Khawaja's book release, maintained that knowledge of the specific sandpaper plot was limited and that ball tampering, while a historical issue in cricket, was not universally known in.