Johnson, who was placed on injured reserve Monday due to a season-ending foot injury, has undergone surgery, Patricia Traina of SI.com reports.
The Giants placed Johnson (foot) on injured reserve Monday, Ian Rapoport of NFL Network reports.
Johnson may miss the rest of the season after injuring his foot during Thursday's loss at Dallas, Art Stapleton of The Bergen Record reports.
Johnson (back) doesn't have an injury designation for Thursday's game against the Cowboys.
Johnson (back) was a limited participant in Tuesday's walk-through practice, Dan Salomone of the Giants' official site reports.
Johnson (back) was estimated as a limited participant in Monday's walkthrough practice, Ralph Vacchiano of Fox Sports reports.
Johnson (back) practiced in full Thursday, Dan Salomone of the Giants' official site reports.
Johnson was limited at practice Wednesday due to a back injury, Dan Salomone of the Giants' official site reports.
Johnson tallied four catches on six targets for 37 yards in Sunday's Week 10 overtime loss to the Panthers in Germany.
Johnson (knee/back) doesn't have an injury designation for Sunday's game against Carolina, Pat Leonard of the New York Daily News reports.