During an interview session at the Major League Baseball Winter Meetings, Francona said that Lester would soon be undergoing the final treatment for his cancer. He declined to elaborate further out of respect for his young pitcher and his family.
The Boston Globe also reported Tuesday that Lester's most recent cancer tests had come back negative and that the disease appears to be in remission.
Lester, 22, was diagnosed with anaplastic large cell lymphoma in August and began his treatments the following month.
The young left-hander won his first six big-league decisions following a call-up from the minors in June. Lester finished 7-2 with a 4.76 earned run average in 15 starts with Boston before his diagnosis.