"To sign the star" is a phrase that means to hire or contract a famous or talented person for a specific purpose, such as acting in a movie, performing in a concert, or endorsing a product. Full definition
Furthermore, signing a star player doesn't lead to as many new kits being sold as one might think. (independent.co.uk)
Having already secured the signing of a superstar midfielder in the form of Paul Pogba from Juventus, Mourinho is interested in signing another star from the Serie A champions in the form of Leonardo Bonucci. (soccerisma.com)
Leicester City were able to fend off Arsenal from signing star striker Jamie Vardy, though it required some considerable convincing on the part of the Premier League champions as well as a new # 100,000 - a-week deal for the Premier League Player of the Season. (caughtoffside.com)