The case involves a dispute between Zamalek Sporting Club and footballer Karim Alhassan regarding the termination of the player's employment contract, adjudicated by the Court of Arbitration for Sport (CAS). The employment agreement, signed in August 2011, included a clause allowing Zamalek to unilaterally terminate the contract at the end of any season without compensation. In May 2012, Zamalek terminated the contract, claiming mutual financial settlement, while Alhassan argued it was unilateral and sought unpaid salaries and compensation for breach of contract. The FIFA Dispute Resolution Chamber (DRC) ruled in favor of Alhassan, ordering Zamalek to pay unpaid wages and compensation, finding the termination unjustified under FIFA regulations. Zamalek appealed to CAS, arguing the termination was lawful under the contract clause. The CAS panel examined several legal principles, including the inadmissibility of counterclaims in appeal procedures, the invalidity of unilateral termination clauses favoring only the club, and the duty to mitigate damages under Swiss law. The panel upheld the FIFA DRC's decision, ruling the termination clause invalid due to its unilateral nature and dismissing Zamalek's claims regarding Alhassan's failure to mitigate damages due to insufficient evidence. The CAS affirmed the compensation awarded to Alhassan, emphasizing equitable treatment in employment contracts and the enforceability of FIFA's regulatory framework. The case also addressed procedural matters, such as the admissibility of evidence and the timing of submissions. The panel rejected Zamalek's force majeure argument, citing lack of evidence, and calculated the compensation based on the player's net salary, deducting hypothetical earnings from subsequent employment. The final award modified the FIFA DRC's decision, ordering Zamalek to pay $6,000 in unpaid salary and $668,000 as compensation for wrongful termination, dismissing all other claims. The ruling underscored the importance of fair contractual practices and the protection of players' rights under mandatory labor laws, reinforcing CAS's role in upholding justice in sports-related disputes.