Arsenal's Greg Oates is continuing to trial with The O's, whilst his Highbury team-mate Joe Osei-Kuffour has joined him with the hope of winning a deal at Brisbane Road.
Another trialist that is looking to impress manager Paul Brush is Chelsea defender Pat Baldwin.
The Stamford Bridge youngster has been told he will not be given a new contract in the summer and can attempt to find a new club.
All three will play for Orient's reserve side when they take on their counterparts from Southend on Thursday.
