Reference

Shunsuke Nakamura decided to transfer from Reggina to Celtic for a few key reasons:

1. Desire for a New Challenge: Nakamura expressed a desire for a new challenge and Celtic provided a prestigious opportunity in a different league. Playing for Celtic, a well-established club in Scotland, allowed him to showcase his skills in a more competitive environment.

2. Reggina's Struggles: During his time at Reggina, the team struggled to avoid relegation almost every season. This constant fight for survival was a concern for Nakamura, who felt that the team's struggles could lead to his own regression from top-level football.

3. Attraction to Celtic's Success: Celtic's success in the Scottish Premier League and their frequent participation in European competitions were attractive to Nakamura. This presented an opportunity for him to play at a higher level and possibly win titles.

These factors combined to make the move to Celtic an appealing step in his career.

For more detailed information, you can visit his Wikipedia page: Shunsuke Nakamura - Wikipedia

Here are some images of Shunsuke Nakamura during his time at Celtic: