[9] He made 13 league appearances from August to November, and then 8 from March to May with the reserves in the Regionalliga Bayern; he scored the only goal on 8 May against FC Ingolstadt 04 II.

[10] He was sent off on his Wolfsburg debut, a 2–0 away defeat to rivals Hannover 96 on 10 August,[11] and only played 9 more league games throughout the season, with just 4 more as a starter.

[12] On 18 January 2016, Klose signed for Premier League side Norwich City on a three-and-a-half-year contract for an undisclosed fee.

[13][14] He made his debut on 2 February in a 3–0 home loss to Tottenham Hotspur,[15] and totalled ten games for the relegated Canaries, scoring to open a 3–2 win over Newcastle United at Carrow Road on 2 April.

[16] In 2018–19, Klose played 31 times as Norwich won the EFL Championship and scored four goals, including both of a 2–1 win at Nottingham Forest on 20 October 2018.

[18] Klose suffered a posterior cruciate ligament injury to his right knee on 27 August 2019, as Norwich were eliminated from the EFL Cup by Crawley Town.

[20] Eight days later, he was sent off for the first time for Norwich, when he pulled down Odion Ighalo in a 2–1 home extra-time loss to Manchester United in the sixth round of the FA Cup.

[21] On 7 October 2020, FC Basel announced that they had reached an agreement with Norwich and that Klose had signed in on a loan contract until the end of the season.

[24] Basel played one of their worst seasons in this campaign and the 2020–21 Swiss Cup match in their own St. Jakob-Park against lower tier Winterthur on 17 February 2021 resulted in a debacle.

Klose's family went through an extreme roller coaster of emotions: "But the club showed enormous understanding for my situation."

[30] After departing Bristol City, Klose retired from playing and began assisting coaching Basel's under-21 side.

[2] Despite rumours about him ending his active career, Klose signed a one-year contract with Basel with the FCB U21 team.

The club announced, that if he brought in his qualities, both on and beside the pitch to the team, then the young players could learn from him just by observing.

He made his full international debut for Switzerland on 10 August 2011, replacing Philippe Senderos in the 57th minute of a 2–1 away friendly win against Liechtenstein.

[32] On 7 October he played his first competitive international and start, as Switzerland lost a Euro 2012 qualifier 2–0 away to Wales.

An injury sustained by Klose while playing for Norwich City in April 2016,[34] ultimately led to him missing selection for Euro 2016.