Nerz studied a large number of league and cup games in England, as well as in Austria and Italy, and sought advice on coaching and tactics from internationally-respected coaches such as Jimmy Hogan, Hugo Meisl and Vittorio Pozzo in a quest to improve the standards of the German national team.
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Notably, Wall refused on behalf of the FA to offer wartime financial compensation to famed Anglo-Irish coach Jimmy Hogan, on the basis of the latter's perceived co-operation with the Central Powers during the First World War (Hogan had coached Hungarian side MTK Budapest whilst interned as an enemy alien during the conflict).