Ghanaian winger is yet to start training with Feyenoord Rotterdam due to delay in his paperwork.
The 20-year-old was at the training complex 1908 on Monday but could not hold pre-season because the paperwork around his transition has not been completed.
Conteh, born in Germany to Ghanaian immigrants, joined the Dutch giants from German second-tier side, St Pauli for a reported €500,000.
The Ghanaian is expected to be key for manager Dick Advocaat in the Dutch top-flight this season.
If the paperwork is finalized, Conteh will start group training with the side for the first time since completing his move to the Eredivisie.