The Scotland international has been sidelined since last December due to a chronic bowel condition and has not yet returned to training.
Sir Alex Ferguson confirmed earlier this month that Fletcher will miss the start of the new season and that the 28-year-old has 'great challenges ahead'.
The situation has prompted suggestions that Fletcher will have to quit playing on a permanent basis, but the midfielder remains eager to return to first-team action.
"That's not really an option, I just want to keep playing," said Fletcher in the Daily Star.
"I know one day I will be back. I'm only 28 and want to give myself every opportunity.
"I've not started training yet, but I'm listening to the doctors and just taking my time. At the moment I feel like I'm capable of coming back."
Fletcher also revealed that United's priority this season will be to wrest the Premier League title away from local rivals Manchester City.
He added: "We'll try and win every cup we can but the main priority is the league. Obviously after Manchester City won the title we are determined to win it back."
adidas has added some color to the Predator line with this new colorway. Released on May 17. Be the first to own a pair.
The adidas Nitrocharge is the most talked about new cleat in years. It was released on May 15 and will take your pitch by storm.
The Liverpool 2013/14 soccer jersey is available for pre-order. The Reds are eager to compete for silver next season.
Chelsea won the Europa League on Wednesday. The Blues defeated Benfica 2-1 on injury time goal from Ivanovic.
Ajax has released their away soccer jersey for the 2013/14 season. Get in the Gear.
One of the top soccer cleats for control the Nike CTR360 will not let you down on the field in tight spaces.
The push for more color on their cleats, adidas has added the infrared colorway to the adiZero f50 Line.
Bayern Munich are kings of Germany and hope to be crowned kings of Europe at Wembley later this month!
The Juventus jersey for the 2013/14 was released earlier this week. Be the first to wear the colors of the Old Lady.
The new PUMA evoSPEED 1.2 FG. A great new soccer cleat with classic look and first time for PUMA to be on the cleat.