It is Adams’ first significant injury, and after appearing to be ready for the USA’s international matches in June, he suffered a recurrence of the problem, forcing him to miss the entire pre-season under Daniel Farke.
Farke said before moving to Bournemouth that Adams will be returning after the current international break, however that will no longer be for Leeds.
Adams’ injury versus Leeds put Forest on hold.
San Francisco 49ers Enterprises had hoped to keep Adams this season, but the 24-year-old stated his desire to return to the Premier League.
He had looked as though he would be joining Chelsea and even underwent a medical before they pulled the plug on a deal at the final moment to pursue moves for Moises Caicedo and Romeo Lavia instead.