The FA also warned the Premier League club about their future conduct after breaching the FA's Football Agent Regulations and approaching the player while he was a teenager on a scholarship agreement with Forest.
Andy Niedzwiecki, the agent representing Lascelles at the time, was fined £10,000 after admitting his part in the matter while the player, who is now 20, has been severely warned as to his future conduct after admitting his part in the deal.
The FA, confirming the punishment on their website, said the time-frame for any appeal had passed.
Lascelles has represented England at Under-18, Under-19 and Under-20 level, has played 19 times for Forest, 15 of those this season, after signing a four-year deal with the Championship side in 2012.
He had a spell on loan at Stevenage in 2011-12 while Forest turned down a £5 million pounds bid for him from Arsenal two years ago.
- Sports & Recreation