Martinez brings in Lawrence
Lawrence, who also worked under Martinez at Swansea and Wigan, will be involved in ensuring information is filtered down to coaches throughout the academy set-up.
Martinez has already signed striker Arouna Kone, defender Antolin Alcaraz and goalkeeper Joel Robles - who all played under him at the DW Stadium - as well as four members of the Latics backroom staff.
Despite increased speculation about an impending deal for Moses, who has flown out for his club's pre-season tour of Asia, Press Association Sport understands it is highly unlikely at this stage.
Martinez is keen to bring in reinforcements in midfield and it is believed he is looking at options elsewhere.