Mats Wieffer

On 17 March 2023, Wieffer received his first call-up to the Netherlands senior national team for UEFA Euro 2024 qualifying matches against France and Gibraltar. He made his debut on 27 March as a starter in a 3–0 win over Gibraltar. On 21 November 2023, Wieffer scored his first senior international goal in the Netherlands' 6–0 qualifying win against Gibraltar. A thigh injury ultimately ruled him out from participating in the final tournament. On 27 May 2026, Wieffer was named in the Netherlands' squad for the 2026 FIFA World Cup. However, he failed to make any appearances at the tournament, with Denzel Dumfries being preferred in the right-back position.

Twente

Born in Borne, Wieffer played youth football for RKSV NEO at the age of five, before joining Twente's academy at the age of ten. He made one Derde Divisie appearance for Jong Twente in the 2017–18 season, prior to making his professional debut for Twente on 30 October 2018 in a 4–2 KNVB Beker win over VV Noordwijk, coming on a substitute for Aitor Cantalapiedra. He made his league debut in a 2–0 win over TOP Oss in March 2019. Twente were promoted to the Eredivisie as champions of the Eerste Divisie in the same season, but Wieffer did not appear for Twente's first team in the 2019–20 season.

Excelsior

In June 2020, Wieffer joined Excelsior on a free transfer, signing a three-year contract with the club. He made his debut for Excelsior on 29 August 2020, replacing Mitchell van Rooijen in a 1–6 win against Jong PSV in the Eerste Divisie. He was sent off with a red card in the league game against FC Eindhoven on 9 October 2020, which ended in a 1–1 draw. On 5 February 2021, Wieffer scored his first goal in professional football in a 0–2 win against Volendam. He was named Excelsior Player of the Year after his first season at the club, winning 26% of the votes. On 29 May 2022, he scored in the penalty shoot-out as Excelsior beat ADO Den Haag in the final of the play-offs to promote to the Eredivisie

Feyenoord

In June 2022, Wieffer moved to Feyenoord on a four-year contract. After getting injured in a friendly against Red Bull Salzburg in…

Club

As of match played 30 August 2026

International

As of match played 3 June 2026

Netherlands score listed first, score column indicates score after each Wieffer goal

Wieffer said that he prefers to play as a number six, but is also able to play box-to-box. He has been praised for his mentality, interceptions, passing and energy and called "the missing link between Feyenoord's offence and defence." In the 2023–24 Eredivisie, Wieffer ranked highly for blocks, interceptions, ball recoveries and tackles. He was compared to Moisés Caicedo and Alexis Mac Allister after his transfer to Brighton & Hove Albion. Since April of Brighton's 2024–25 Premier League campaign, Wieffer has been most frequently deployed as a right-back by head coach Fabian Hürzeler, a position he quickly grew accustomed to as he ranks in the 95th percentile of right-backs for tackles won and clearances during the 2025–26 Premier League.