Crystal Palace are set to announce former Ajax and Inter Milan manager as their new boss at 14:00 BST on Monday.
It is understood the former Netherlands defender, 47, was the first choice of chairman Steve Parish and Palace were De Boer's preferred option.
He will succeed Sam Allardyce, who left after helping Palace avoid relegation from the Premier League last season.
De Boer has been out of work since he was sacked by Italian side Inter in November after only 85 days in charge.
Between 2010 and 2016, De Boer managed Ajax, winning the Eredivisie four years in a row between 2011 and 2015.