Celtic want to have a look at Real Valladolid's Jacobo and Nigerian striker Manasseh Ishiaku on trial.
Cologne have told Manasseh Ishiaku and Marvin Matip that they are free to leave the club.
Bundesliga new-boys Cologne have signed Manasseh Ishiaku from relegated MSV Duisburg.
Bundesliga bottom club MSV Duisburg will be without top-scorer Manasseh Ishiaku for several weeks.
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