Crimson Tide coach Nate Oats said Tchikou had surgery Wednesday in Birmingham and is expected to make a full recovery.
The 6-foot-11, 225-pounder was a four-star prospect who several recruiting services ranked as one of the nation's top 60 recruits.
Tchikou played one year at Dream City Christian High School in Glendale, Arizona, after moving to the United States from Paris at age 16.
"It's really tough to see Alex go down for the season,'' Oats said. "Alex is someone who arrived in early August and had quickly established himself in the locker room.
"He has been a great fit with our program in terms of his work ethic and character. More importantly, he is an upbeat young man with a terrific attitude about him which will be important as he begins his rehabilitation.''