"I want to play every game, I don't like to sit on the bench," Boerrigter told reporters. "So, for that reason, it was better for me to leave.
"I am here to win championships and perform very well in the Champions League. I won three titles in a row in Holland - the first with RKC Waalwijk in the Second Division and then twice in a row with Ajax. So I hope I can make it four in a row.
"There was a lot of interest from other clubs, but when Celtic came I didn't have to think long. Celtic is a very big club in Europe. In Holland, we know them well."
Boerrigter, who arrived in Amsterdam from RKC Waalwijk in 2011, started 16 games in the Eredivisie last season.