I first got news of this potential signing on the way home from Port Vale on Tuesday night but at that time knew little of the 27-year-old former Germany under-21 striker.
He started his career with Hamburg SV. He made over 50 appearances for their second team without making the first team. He enjoyed loans with VfL Osnabrück and FC St. Pauli.
He wasn't particularly successful in terms of goalscoring during those loans but he certainly found the net for his country, scoring 13 times in 21 under-21 internationals.
At the end of his loan at FC St. Pauli in 2009, he signed for them permanently and spent three years there with another return to VfL Osnabrück in 2012, just before he made the move to Karlsruher SC.
In three years there he's scored 37 goals in 95, helping them to promotion to Bundesliga 2 and last season becoming the league's leading goalscorer with 18 goals in 29 games as they finished third and reached the play-offs where he scored a further goal before missing a late penalty as they lost 3-2 to Hamburg.
This summer he's been linked with Werder Bremen and a return to Hamburg while there was an offer from PAOK Salonika where sporting director Frank Arnesen was keen to sign him.
Last month our Championship rivals Sheffield Wednesday had an offer for him rejected but the Clarets have been successful with Hennings now a Burnley player.