Japan international Miyaichi, who joined on a season-long loan from Arsenal last summer, last played for the Latics in their 3-0 away defeat to Liverpool on November 17 - a game in which he was making his comeback from a groin complaint.
The 20-year-old told wiganlatics.co.uk: "It will be a big relief to get back because it has been quite a tough time to be sat on the sidelines.
"I had a groin injury at first when I was with the national team last year.
"That injury put me out for a few months and then I came back in the game against Liverpool at Anfield and after that game I picked up an ankle injury which has made things frustrating.
"I trained after that game and it made my ankle worse but I can learn many things from this injury."
With 12 matches to go, Wigan are second-bottom of the Premier League, two points behind 18th-placed Reading and three adrift of 17th-placed Aston Villa.
Miyaichi is eager to boost the Latics' survival bid, adding: "It is important now for us to win as many games as possible because we are desperate to stay in the Premier League.
"I want to be able to help the team in achieving safety in the Premier League and it will be great to show the supporters what I can do once I am back."