The 19-year old discussed his relationship with Muamba after contributing an assist to Bolton's crucial relegation clash against Blackburn on Saturday afternoon
The match was the first for the team since the sudden collapse of Fabrice Muamba seven days prior during an FA Cup fixture against Tottenham. That match was abandoned, and the following Premier League date against Aston Villa was also postponed.
"For [Fabrice] Muamba and for us it was a must-win," Miyaichi told reporters after the match. "So I'm relieved that we played well and got a good result.
"We knew that no matter how hard it was for us, he was the one suffering and we had to play well for him."
The 19-year-old set up his team's second goal with a well-placed corner kick that David Wheater headed in at the 34th minute.
"I've practiced corner kicks before, but after being given the responsibility [of taking the corners] I'm glad I was able to contribute to a goal," the former Feyenoord winger elaborated.
Miyaichi also reminisced about meeting Muamba after arriving at Bolton.
"[Fabrice] was the first player who talked to me when I came," the youngster recalled. "He greeted me in Japanese, and I thought 'wow, there are some really happy players here!'
"All we can do right now is pray for him."