2021 Malaysia Cup knockout stage

The 2021 Malaysia Cup knockout stage began on 14 November and ended on 30 November 2021 with the final at the Bukit Jalil National Stadium in Kuala Lumpur, Malaysia, to decide the champions of the 2021 Malaysia Cup. A total of 8 teams competed in the knockout stage.

The top two teams from every four groups from the group stage advancing to the knockout stage beginning with the quarter-finals followed by the semi-finals and the final. This stage will be played in two legs except for the finals which is played once.

Round and draw dates
The schedule was as follows (all draws were held on 15 September 2021 at the Malaysian Football League (MFL) headquarters in Putrajaya, Malaysia).

Format
The knockout phase involves the eight teams which qualified as the winners or runners-up of each of the four groups in the group stage.

Each tie in the knockout phase was played over two legs, apart from the final, with each team playing one leg at home. The team that scored more goals on aggregate over the two legs advanced to the next round. If the aggregate score was level, the away goals rule was applied, i.e. the team that scored more goals away from home over the two legs advanced. If away goals were also equal, then thirty minutes of extra time was played. The away goals rule was again applied after extra time, i.e. if there were goals scored during extra time and the aggregate score was still level, the visiting team advanced by virtue of more away goals scored. If no goals were scored during extra time, the tie was decided by penalty shoot-out. In the final, which was played as a single match, if scores were level at the end of normal time, extra time was played, followed by a penalty shoot-out if scores remained tied.

The mechanism of the draws for each round was as follows:
 * In the draw for the quarter-final, the four group winners were seeded, and the four group runners-up were unseeded. The seeded teams were drawn against the unseeded teams, with the seeded teams hosting the second leg. Teams from the same group or the same association could not be drawn against each other.
 * In the draws for the quarter-finals onwards, there were no seedings, and teams from the same group or the same association could be drawn against each other.

Qualified teams
The knockout phase involved the 8 teams which qualified as winners and runners-up of each of the eight groups in the group stage.

Bracket
 

Summary
 The first legs were played on 14 November, and the second legs were played on 18 November 2021.



Matches
Melaka United won 3–1 on aggregate.

Kuala Lumpur City won 3–0 on aggregate.

Terengganu won 6–3 on aggregate.

Johor Darul Ta'zim won 1–0 on aggregate.

Summary
 The first legs were played on 22 November, and the second legs were played on 26 November 2021.



Matches
''2–2 on aggregate. Kuala Lumpur City won 5–3 on penalties.''

Johor Darul Ta'zim won 4–1 on aggregate.

Final
The final was played at the Bukit Jalil National Stadium in Kuala Lumpur on 30 November 2021.