Sport's arbitration court (CAS) has ruled that a FIFA transfer ban on Chelsea signing players must be lifted. The Court of Arbitration for Sport said Thursday that Chelsea and French club Lens had reached an agreement in their dispute over teenager Gael Kakuta's move to England in 2007. CAS said the clubs agreed Kakuta did not have a valid contract with Lens and so could not have breached any rules when he joined Chelsea. FIFA imposed the one-year transfer ban on Chelsea last September after Lens appealed to the global governing body. CAS said the FIFA sanction on Chelsea now had to be lifted. 