Jack Werndly played and scored in Norwich's Under-18s 4-0 win over Birmingham on 11th August 2010. He joined the Canaries from West Ham where he had been top scorer in the Under-15s. The Canaries took over his second year scholarship

He broke his collar bone against Portsmouth on 9th October 2010 and was out of action until January 2011

In April 2011, Werndly played for Gillingham's reserves on trial, playing against Crawley and Canterbury alongside fellow triallists Paco Craig (West Ham), Joe Carter (Charlton), Matt Pooley and Chris Palmer.

Jack transferred to Rangers in the summer of 2011. He joined Alloa Rovers on loan in January 2012, scoring three goals. At the end of the season, he returned to England, signing for St Neots Town.

In August 2013, he signed for Huntingdon Town of the United Counties League. He then played for St Neots Town before joining Olney Town in July 2015, they play in the United Counties League Division One.