The England international has returned for pre-season training after suffering a double-jaw fracture against Belgium at Wembley which ruled him out of Euro 2012
Cahill suffered the injury in an England friendly, as he collided with goalkeeper Joe Hart following a push by Belgium attacker Dries Mertens.
The defender was still hoping to partner Blues team-mate John Terry at Euro 2012 in the centre of defence, but was ruled out following scans that revealed the severity of his injury.
After winning the Champions League and FA Cup in his first season with Chelsea, missing the European Championship was a blow for the 26-year-old, but the England International will now look ahead to a new season with the Premier League side.
The former Bolton player returned for pre-season training ahead of the Blues' tour of the United States, where they will face the Seattle Sounders, Paris Saint-Germain, an MLS All-Stars team, and AC Milan, before heading back to the UK for a friendly against Brighton before the season opener against Manchester City in the Community Shield.