Midtsjø began his professional career at Norwegian club Rosenborg in 2010. After loan spells at Ranheim and Sandnes Ulf he became a regular in their team, making 96 league appearances and scoring 12 goals for Rosenborg. He signed for AZ in 2017.
Midtsjø made his full international debut in 2016.
Club career
Rosenborg
Midtsjø made his debut as a 16-year-old in the Norwegian Cup in May 2010 against his childhood team Stjørdals-Blink.[3] Not long later he officially became a part of the Rosenborg squad.[4] However, during the summer, Rosenborg brought in new players and decided to send him out on loan to local second-tier team, Ranheim for the rest of the season.[5]
Upon his return, he suffered a broken leg in a game for the second team, keeping him out for 7 months.[6][7] After recovering from the injury, Rosenborg decided it was best to send him out on loan to another Tippeliga team, Sandnes Ulf for the 2014 season.[8] He made his competitive debut for Sandnes Ulf on 30 March 2014, replacing Steven Lennon in a 1–1 draw against Odd.[9] On 30 April, he scored his first competitive goal for the club, in a 2–1 home win over Stabæk.[10] Midtsjø made a total of 28 appearances for Sandnes Ulf, in which he scored 5 goals as the club suffered relegation to the second division following the 2014 season.
Following the expiration of his loan, Midtsjø returned to Rosenborg and was part of the team for the 2015 season.[11] He signed a new four-year contract with the club on 29 June 2016.[12] On 24 October, he was nominated for the Kniksen Award as best midfielder of the 2016 Tippeligaen, eventually losing out to teammate Mike Jensen.[13]
AZ
On 26 August 2017, Midtsjø joined Dutch Eredivisie club AZ for an undisclosed fee, signing a five-year contract. He was assigned shirt number 6 by the club.[14][15]
Galatasaray
On 2 August 2022, Midtsjø joined Turkish club Galatasaray for a fee of €3.5 million, signing a three-year contract.[14][16]
He won the Süper Lig in the 2022–23 season with the Galatasaray team, the 23rd championship in the club's history.[17]
Pendikspor
It was announced that he was transferred to the Süper Lig team Pendikspor on 7 September 2023.[18]
Eyüpspor
On 1 July Norwegian media announced that Midsjø has joined the newly promoted club Eyüpspor on a one-year deal.[19]
International career
He made his Norway national football team debut on 24 March 2016 in a friendly against Estonia.[20] He continued to get called up occasionally through 2016 and 2017, and played his second game for his country, and his first as a starter, two years later on 23 March 2018 in a friendly against Australia.[21]
^Skogli, Chris Thomas (24 September 2016). "Se RBK feire gull nummer 24" [Watch RBK celebrate gold number 24]. Archived from the original on 6 October 2016. Retrieved 2 October 2016.