 Johnson has played only seven times for Chelsea this season |
Chelsea defender Glen Johnson travelled to Germany on Thursday to undergo hernia surgery. The 21-year-old full-back is expected to return to fitness before the end of the season.
"With modern surgical techniques and the medical staff Chelsea has in place, we are confident he'll be playing very quickly," said a Chelsea statement.
Johnson has found it difficult to break into Chelsea's first team this season, making only seven appearances.
In September, he was sent home from England Under-21 duty - amid reports of poor timekeeping, although Chelsea insisted he had a thigh strain.
However, he enjoyed a spell in Chelsea's starting XI in January and February, earning him a recall into the England under-21 squad for a friendly against Norway.