disable a cipher in the sshd config

On our rhel 7 server, i need to disable 3des-cbc. Normally that entry should be in the file sshd_config, but there are no entry's regarding cipher.
If i run the command sshd -T | grep -i 'cipher', all ciphers are shown, including 3des-cbc.

In this case where and how do i disable this?

Regards, Paul.