Michael Keane is working hard as he prepares to make his second senior start for Manchester United against Chelsea.
The 19-year-old centre-half made his full debut in the young back-line which helped beat Newcastle United 2-1 in the third round of the Capital One Cup.
United boss Sir Alex Ferguson is expected to select the same defensive unit against the Blues on Wednesday and Keane is looking forward to another taste of the action.
He told the Daily Mirror: "I was so tired after the Newcastle tie. I've never been that tired after a game, mentally as well as physically because of the concentration.
"How the day went building up to it, and then the 90 minutes, was tough, but we did well.
"When you play a few games, it gives you a good taste of first-team football and it just makes you want to play more.
"I know there's probably only going to be one or two opportunities because of the players involved, but I can't think like that.
"I've just got to work hard every day in training and prove I'm good enough to play and, hopefully, get picked."