The game began with the Premier League side looking most likely to score, with Michael Antonio sliding the ball to Oko-Flex, but the low shot was easy to collect for Lawrence Vigouroux.
From there, Orient grew into the game, and buoyed by the 2,000 or so home fans, started to take the game to West Ham.
Academy player Daniel Nkrumah, playing on the left of the front three, was a bright spark, and linked up well with Dan Kemp.
The ball was crossed into a dangerous area by Kemp, but the ball was cleared well by Ogbonna.
Orient continued to sit in the driving seat, and after Shadrach Ogie’s long range distance, The O’s came very close to breaking the deadlock.
The pacey Paul Smyth found space on the right-hand side and drilled the ball across the face of goal, looking for Daniel Nkrumah however, Harrison Ashby was there to clear.
After the break, it was more of the same, with Orient seeing more of the ball, and working dangerous situations.
A golden opportunity came when the ball was cleared to the edge of the area, for Darren Pratley to volley it over the bar, first time.
Jackett then made changes, with the impressive Daniel Nkrumah making way for Matt Young, whilst Sam Sargeant replaced Lawrence Vigouroux.
Aaron Drinan was a thorn in the side to the West Ham defence, with his relentless pressing forging opportunities, and he nearly broke the deadlock in spectacular fashion.
The forward stuck it sweetly first time from fully 30 yards, with it dipping towards the top-right hand corner – but ended up just over the bar.
West Ham had chances late on, with Michael Antonio testing Sargeant late on with what looked certain to be a goal – but the Orient keeper made a fantastic reflex save to deny him.
Soon after Antonio had another opportunity with a close range header, but the Orient stopper denied him once again.
Despite some late pressure, Orient couldn’t force a winner, and left the field with another important 90 minutes under the belt.
Leyton Orient: Vigouroux (Sargeant 61’), Wood (Sweeney 82’), Happe, Smyth (Clarke 75’), Clay, Kemp (Sotiriou 90′), Nkrumah (Young 64’), Drinan, Pratley © (Papadopoulos 72’), Ogie, Kyprianou (Hodson 88’).
Subs unused: Cisse, Hobbs*.
*Denotes short-term contract
West Ham: Randolph, Cresswell, Noble ©, Ogbonna, Oko-Flex, Antonio, Johnson, Silva, Ekwah, Ashby, Baptiste.
Subs: Knighbridge, Potts, Diallo, Chesters, Dju, Greenidge.