The midfielder joined the O’s in early August from parent club Tottenham Hotspur, originally agreeing a loan deal until January and has since made 18 appearances for Orient.
Marsh made his debut against Southend United in the Leasing.com Trophy, a game Orient won 2-0 at the Breyer Group Stadium. The number 21 would then go on to feature against Exeter, recording the first Football League appearance of his career, as the game finished 2-2.
“I’m absolutely delighted that he has signed for the rest of the season. It’s fantastic for us as a Club and for George and his development.
He came out here on his first loan and has played a lot of football; it was a slow start, but I think he has really shown everyone here what he is about as a character, what he is about athletically and the quality he has got as a footballer.
We’re delighted to have him. From our perspective he is a good player that we can have again for the second half of the season.”