The 20-year-old endured a difficult start to the campaign due to injury but is hopeful he can play a big role for the Shrimpers as they look to earn promotion to League One.
He told the club's official website: "For me personally it was great to be back playing again and it was a vital win for the team too.
"It had been a frustrating time for me getting niggling injuries and not playing and the last few results hadn't been too good either.
"But the win at Chesterfield was a character building result and hopefully we can build on that now and hopefully I can play a part in that."
Leonard started the first six games of Southend's season before being struck by a hamstring injury. Since then he has made the starting line-up just three times and has made five substitute appearances.
Despite that, and a lack of reserve football, he was able to put in a strong performance and last the full 90 minutes at the Proact Stadium.
"I was feeling it a bit in the last five minutes but I was fine up until then. You do extra training when you're not playing but it's hard to replicate what it's like when you're playing.
"The game would have done me a lot of good though and I want to try and push on now and remain involved for this Saturday's game against Oxford."