Atletico Madrid cannot sign players in January
The Spanish side and rivals Real Madrid were banned last January from registering players for two windows for breaching rules over the transfer of players under 18.
However both were allowed to continue to make signings while they appealed.
But Atletico have now agreed to “waive its right to seek the suspension of the ban for the winter transfer period”.
A club statement, which reiterated that they are “completely unmoved in its position that the transfer ban is unjustified”, said it was “to ensure a procedural calendar that allows Atletico Madrid to fully present its appeal, while giving Cas sufficient time to thoroughly consider all the arguments”.
Real are still allowed to sign players in January.