The newly crowned Serie A champions have been pushing for the deal since the end of the 2024-25 season, and it now looks set to be completed imminently.
According to Fabrizio Romano, Napoli have agreed a fee of €31 million plus add-ons for the 26-year-old centre-back.
Beukema is understood to have agreed personal terms with Antonio Conte’s side weeks ago, and the necessary paperwork is being filed.
The Dutchman played a key role for Bologna last season, popping up with two assists in his 47 games across all competitions.