O’Brien spent the first half of the 2023 MLS campaign with DC United after a proposed deadline day move to Blackburn fell through and there was no room in Forest’s first-team squad.

The 25-year-old former Huddersfield man spent last term at Middlesbrough.

However, as he is not part of new Forest boss Nuno Espirito Santo’s plans either, O’Brien has taken up the option of another stint in MLS and sources confirmed O’Brien has flown to the United States to complete the move.

LAFC are currently second behind city rivals LA Galaxy in the western conference of MLS and are looking to secure a second title in three years.