Now he looks certain to play a key role in the Final as the south Londoners go into action against Sunderland on May 26.
The 23 year old has been told by Manuel Pellegrini that he wants him back for pre-season and now has a real opportunity to impress the boss into keeping him at the club.
Ok, League One is not the Premier League but the midfielder has had a top spell with Charlton scoring twice and assisting in six goals as the Addicks mounted their bid for Championship football next season.
Both Cullen and Edmilson Fernandes – who has been on a loan spell with Fiorentina – are expected to be watched closely by Pellegrini in pre-season before any final decision is made on their futures.