Leeds United added a 'significant' sell-on clause in Niall Huggins' contract when he moved to Sunderland, according to recent reports.

The Lowdown: Huggins joins Sunderland

The 20-year-old moved to the Stadium of Light during the summer transfer window, bringing an end to his time as a Whites player.

Huggins couldn't see a path into the first team at Elland Road, deciding that a switch elsewhere would benefit him moving forward, and he started his Black Cats career off with an entertaining 3-2 win at Blackpool.

The Latest: Leeds included sell-on clause

According to Elland Road sources at Football Insider, despite not earning an initial fee from the move, Leeds included a sell-on clause which will allow them to receive a 'significant' chunk from Sunderland if he ever moves on from Wearside.

It means the Whites could actually have done some very clever business and end up getting an even larger amount than if they had requested an immediate profit, unless he never leaves the Black Cats of course.

The Verdict: Blow to future profits

Huggins is still waiting for his Sunderland career to fully ignite - he has only made one League One appearance to date - but he is an exciting signing with lots of potential.

The right-back has one Premier League appearance to his name from his Leeds days and has been hailed as 'fantastic' by former Whites hero Ian Harte.

The hope is that he stays at Sunderland for many years to come, but based on that praise and the fact he managed to force his way into a top flight side even briefly, one would have to assume the Black Cats may be looking to cash in for profit at some point in the future.

News of such a 'significant' portion of that profit going to Yorkshire is certainly a blow.

In other news, Lee Johnson has set an appearance target for one Sunderland player. Find out who it is here.