The 23-year-old was unveiled as a Red earlier on Wednesday after completing his transfer from Ajax, where he had sported the no.6 shirt since 2017.
Donny previously wore no.30 for the Amsterdam club, as well as donning various shirt numbers during his 10 international appearances with the Netherlands.
The midfielder has asked for the no.34 jersey ahead of the 2020/21 campaign though, as a tribute to former Ajax team-mate Abdelhak Nouri, who collapsed and suffered a cardiac arrhythmia attack during a pre-season game in 2017.
Nouri, who is a close friend of van de Beek’s, with the pair having come up through the youth ranks together at the Amsterdam club, was left with serious and permanent brain damage after the incident against Werder Bremen, meaning his career had to be cut tragically short.