Early career

Toornstra was born in Ter Aar.^[3] In his youth, he played eight years for amateur football club Alphense Boys in the Tweede Klasse C. In his last year he scored 20 goals for the team.^[2] He impressed so much Kees Jansma recommended Toornstra to ADO Den Haag.^[2] Initially, the scouts of ADO Den Haag did not believe Toornstra would be as good but ADO Den Haag bought Toornstra for the reserve squad.

ADO Den Haag

In the summer of 2009 Toornstra came to ADO Den Haag with a contract until July 2012. He made his debut in the 3–0 victory against Willem II.^[4] Soon, he became first team player for ADO and quickly gained interests from AZ, FC Twente and Roda JC.^[5] Toornstra signed a new improved contract on 4 July that same year until the summer of 2013.^[6]

In the 2010–11 season Toornstra received the jersey number 7, last worn by Karim Soltani who moved to Iraklis Thessaloniki F.C. He scored his first goal for ADO Den Haag in January against Excelsior^[7] after missing not a single game. On 26 May 2011,^[8] He scored a hat-trick against Groningen in the first leg of their Europa League semi-final. His goals helped Den Haag to a 5–1 lead on aggregate.^[9]

Utrecht

At the end of the winter transfer window, Toornstra signed with FC Utrecht.^[10] He grew out to be one of the important players.

Feyenoord

On 25 August 2014, Toornstra made a transfer to Feyenoord for a fee of €3.5 million. He signed a four-year deal.^[11]

On 22 April 2018, he scored as Feyenoord won the 2017–18 KNVB Cup final 3–0 against AZ Alkmaar.^[12]

Utrecht

On 23 August 2022, he returned to his old club FC Utrecht on a free transfer.

Club

As of match played 25 May 2022

International

As of match played 31 May 2017