Cape Town - Schalke 04 will wait to determine the extent of the injury sustained by on-loan left-back Abdul "Baba" Rahman before extending his loan deal.
The 22-year-old Chelsea defender, who spent the 2016/17 on loan with the German giants, picked up an anterior cruciate ligament injury while on international duty with Ghana in January - but has been slow to recover.
A former Young Meteors Tamale and Dreams FC youth player, Rahman spent some time on loan with Asante Kotoko before spells with Greuther Fürth and FC Augsburg ahead of joining the Blues in 2015.
With his current deal coming to an end, Schalke will want to ensure the player is fully-fit before he signs a new contract.
Schalke sporting executive Christian Heidel told Bild: "Our team doctor met Abdul in London. His knee injury is more complex and [his recovery] might be prolonged.
“We will wait another four weeks and then decide with Baba and his agent whether [another loan] makes sense."