Petr Cech has returned to Chelsea days after he left Arsenal FC.
Cech is back as Technical and Performance Advisor.
A statement on the club website on Friday said the focus of the job will be to provide advice on all football and performance matters throughout the club, as well as embed and facilitate strong links between the club's men's and academy teams, ensuring that the various support departments are working together effectively.
It added: "Petr will be based at Cobham and will work closely with Chelsea Director Marina Granovskaia. His role will also align him with the men's first team coaching and backroom staff, travelling with the team home and away with an emphasis on strategy and performance."
Cech said: "I feel very privileged to have this opportunity to join Chelsea FC again and help create the best possible high level performance environment to continue the success the club has had over the past 15 years.
"I'm looking forward to the new challenge and hope I can use all of my football knowledge and experience to help the team achieve even more success in the future."
Chelsea Director, Granovskaia said: "We are delighted to welcome Petr back home to Chelsea. During his playing career here he was one of the most dedicated, successful and thoughtful professionals we have ever had.
"We always hoped that when Petr was ready to retire we would see him back at Chelsea FC and we are thrilled to add his expertise and knowledge of the game to the technical staff."
In his glittering Stamford Bridge playing career, Cech won every major club honour possible. He surpassed Peter Bonetti's Chelsea clean-sheet record and became its highest overseas appearance maker.
In his first season, 2004/05, Cech registered a record 24 Premier League clean sheets as the club romped to the title conceding just 15 goals along the way. He was equally impressive the following year as Chelsea maintained its status as the country's best team with the meanest defence.