Midfielder limped off
Rodwell lasted a mere 10 minutes before limping off against Italy Under-21s where Stuart Pearce's men went down 1-0 to a late Federico Macheda goal.
The player underwent scans on Wednesday at his club and confirmed the outcome on his own Twitter account on Wednesday evening:"Four to six weeks out. Gutted, but will come back stronger," he posted.
The 19-year-old has been hampered with injuries over the past year, with this one being the most serious to date.