Peterson playing for Liverpool under-21s in 2012
|Full name||Kristoffer Paul Peterson|
|Date of birth||28 November 1994|
|Place of birth||Gothenburg, Sweden|
|Height||185 cm (6 ft 1 in)|
|2013–2014||→ Tranmere Rovers (loan)||6||(0)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 20 April 2014.
† Appearances (Goals).
He made his debut for the Under 18s in the 2010-11 season, however he was to only play the one match for the Under 18s that season as he played more frequently for the Under 16s. During the 2011-12 season, operating mostly as a midfielder, Peterson figured for the Under 18s far more prominently, and produced some eye-catching performances from the centre of the park. He was one of the stand-out performers for the side, netting five goals in 22 games. His good form brought him to the attention of Reserve team coach Rodolfo Borrell, who used the young starlet as a second-half substitute in the Under 19s NextGen Series tie against Molde FK. He also featured in the NextGen Series third place play-off tie against Olympique de Marseille. Now operating further up the pitch, often in a wide forward role, in the 2012-13 season, Peterson continued as one of the U18's star players. He featured 23 times and scored nine goals and also made his step up to the U21s, for whom he featured 13 times- seven of which came in the NextGen Series. Peterson kicked on in the 2013-14 U21s season as he netted all three of Liverpool's goals in their four pre-season friendlies, with goals against Glentoran F.C., Heart of Midlothian F.C. and Bologna F.C. 1909 first teams.
On 28 November 2013, his birthday, Peterson was loaned to League One side, Tranmere Rovers. Two days later he made his debut against Colchester United in a 2–1 win at Prenton Park and was awarded Man of the Match, with his manager Ronnie Moore predicting that "he's going to play at the top level." 
In January 2014 he signed an extension to his contract with Liverpool. and said he would use it to spur him on: "This is the biggest motivation boost in my career. This is the biggest I have ever experienced".
He completed the U21s season at Liverpool with 6 goals and 15 appearances to his name. He went on to appear as a substitute in the Liverpool first team's post-season friendly win over Shamrock Rovers at the Aviva Stadium, replacing Iago Aspas in a 4-0 win, being handed the number 54 shirt on 14 May 2014. On 16 July 2014, Peterson came on as a second-half substitute in Liverpool's pre-season match away to Brøndby, and netted a tap-in in the 49th minute after good work from Jordon Ibe. He also scored again in Liverpool's next pre-season match, away at Preston - firing the winner in a 2-1 win. After the game, manager Brendan Rodgers confirmed he would now take Peterson on Liverpool's pre-season tour of America, having initially failed to make the cut, along with the most of the club's younger players.
- As of match played 19 April 2015.
|Tranmere Rovers (loan)||2013–14||League One||6||0||1||0||—||—||7||0|
- "Barclays Premier League Squad Lists 2013/14 are revealed". Premier League. Retrieved 29 December 2013.
- "Kristoffer Peterson - Liverpool FC". Liverpool FC. 18 December 2013. Retrieved 18 December 2013.
- "Tranmere Rovers: Edwards, Otsemobor & Peterson join on loan". BBC Sport. 28 November 2013. Retrieved 30 November 2013.
- "Tranmere v Colchester". BBC Sport. 30 November 2013. Retrieved 30 November 2013.
- "Ronnie: Win Was Deserved". 30 November 2013. Retrieved 30 November 2013.
- "Transfer news: Kristoffer Peterson seeks loan switch after penning Liverpool extension". Sky Sports. 21 January 2014. Retrieved 2 February 2014.
- "Peterson van Liverpool naar FC Utrecht". FC Utrecht.
- "Kristoffer Peterson". Soccerbase. Retrieved 20 April 2015.