Sivert Heggheim Mannsverk (born 8 May 2002) is a Norwegian professional footballer who plays as a central midfielder for EFL Championship club Cardiff City, on loan from Eredivisie club Ajax.

In January 2021, Mannsverk was linked with moves to Aston Villa, Everton, Inter Milan and Bologna.

[3] On 1 September 2023, Mannsverk signed a five-year contract with Ajax in the Netherlands.

[4] On 28 January 2025, Mannsverk signed for EFL Championship club Cardiff City on loan until the end of the season.

This biographical article related to a Norwegian association football midfielder is a stub.