Defender Musah Nuhu has been ruled out of the 2019 Africa Cup of Nations tournament after suffering a knee injury during Black Stars training on Wednesday in Dubai, United Arab Emirates. 

The St Gallen star is one of five debutants named by Kwesi Appiah in the Black Stars 29-man provisional squad ahead of the tournament. 

A statement on the Ghana FA website said: ''Switzerland based Ghanaian defender, Musah Nuhu, has been granted permission to travel back to Switzerland at the request of his club, St. Gallen

''Musah sustained an injury during Black Stars training last Wednesday.

''After an initial medical examination by the Black Stars medical team, Nuhu has been permitted to return to his club for further assessment. Nuhu will be accompanied by Team Psychologist, Dr Patrick Ofori.''

Musah departure means Ghana's provisional squad has been reduced to 28 ahead of the naming of the final 23-man squad.

The Black Stars are hoping to win their first Afcon trophy since 1982 in Egypt this year.