The England goalkeeper has been dogged by injuries over the last 18 months, but he is in line to start in goal for United on Sunday.
And Foster hopes a place at Wembley, and subsequent victory, will help him make his mark once again.
"If I do play, it'll be fantastic. To play Sunday would be an unbelievable bonus and a massive up for me," he said.
"It's been heartbreaking to watch United win things when I cannot be involved.
"Sunday could be a stage for me to remind people of what I'm about.
"My England debut was a big one for me and I played in a play-off final so I have some big matches under my belt.
"I dealt with those games reasonably well so, hopefully, this will not be any different.
"I had a reputation as a decent up-and-coming keeper and in the last couple of years, because of circumstances, I have almost faded away.
"Now I seem to be putting a run of fitness together. I'm training every day, my body feels good and I'm playing the odd first-team game.
"Sunday will be a good chance to get my name back out there and people can see that I am still around and still a good goalkeeper."
Injury jinxFoster has failed to become United's number one, as many expected, due to his horrendous run of injuries.
He suffered ligament damage in the summer of 2007 as he returned to United from a successful loan spell at Watford.
"It has been an absolute nightmare from when I came back from Watford. It just seems to be injury after injury," he continued.
"When I had my cruciate, I knew I was going to be out for a year and that was acceptable.
"But when you get fit and then go over on your ankle and are out for six weeks and are back for a month and you break your thumb - it just seemed to be one thing after another.
"I don't want to be tarnished with the tag of being an injury-prone player. Nobody wants to be tarred with that. It has just been unlucky.
"I broke my thumb, for instance, in training. It was probably the last catch of the session. It was the day before we went to Japan so I missed that trip."