England's Itoje will be fit for Six Nations
Itoje, 23, sustained a fractured jaw in the 19-20 defeat at Harlequins on December 3 and required surgery in which two plates were inserted in his face. There were fears he would not recover in time to face Italy on February 4.
But a visit to a specialist brought a more optimistic prognosis, pointing to a return for the final two rounds of Saracens' Champions Cup group campaign against the Ospreys and Northampton.
"Maro is probably three or four weeks away. He went to see the specialist who said a maximum of six weeks and he's already done a week and a half," said Saracens Director of Rugby Mark McCall.
Itoje was nominated for World Rugby's World Player of the Year for 2017 after a stunning 12 months that included England's Six Nations win, Saracens' second consecutive European triumph and the British and Irish Lions' drawn series with world champions New Zealand.
Agence France-Presse