The Honduran full-back was Scotland's Player of the Year in 2011 before being struck down with a badly broken leg which he thought could end his career.
But the former Motagua ace returned to the fray last season with 32 SPL appearances and is now looking to regain that form that made him a Parkhead hero.
"I need to get back to the way I played in my first season at Celtic," he told SunSport.
"I was so happy to win the Player of the Year award in 2011, and I'm working hard every day to get back to that level again.
"The injury I had was very difficult for me. After I had the operation I cried every day for a month.
"I had great support from my wife and son, but in my head I found it so difficult because football is my life.
"It was very tough. I like to work hard and play hard and enjoy my football.
"I tried my best when I came back and played last season, but I hope I will show my recovery is complete this season.
"I need to show my injury is in the past and I'm looking forward to what is coming next for me.
"I believe I can get back to the level I reached when I was named the best player in Scotland.
"I want to get back to the Emilio everyone saw in my first season at Celtic, and I will work very hard every day to do that.
"I desperately want to play in the Champions League. I want to help the team get through the qualification games and reach the group stages.
"Celtic did so well in Europe last season and we need that again."