The eighteen group winners have the opportunity to be promoted directly to Segunda División B. The eighteen group winners were drawn into a two-legged series where the nine winners will promote to Segunda División B. The nine losing clubs will enter the play-off round for the last nine promotion spots. The eighteen runners-up were drawn against one of the eighteen fourth-placed clubs outside their group and the eighteen third-placed clubs were drawn against one another in a two-legged series. The twenty-seven winners will advance with the nine losing clubs from the champions' series to determine the eighteen teams that will enter the last two-legged series for the last nine promotion spots. In all the playoff series, the lower-ranked club play at home first. Whenever there is a tie in position, a draw determines the club to play at home first.
The teams that finished fourth in their groups are drawn against teams that finished in second place, with the latter hosting the second leg. The teams that finished third in their groups are drawn against each other.
The nine losers of the Group Winners Promotion Play-off plus the twenty-seven winners of the Non-champions Promotion Play-off first round will take part in this round. The teams will be matched by drawing of lots, subject to the fact that those who obtained the best position in the league face those who got worse, disputing the first match in the sports facilities of the latter and avoiding wherever it is possible that they compete among themselves clubs from the same group.
Qualified teams
Group
Pos.
Team
1
1st
Compostela
4
1st
Cultural Durango
6
1st
Atlético Levante
8
1st
Unionistas
10
1st
Cádiz B
11
1st
Mallorca B
12
1st
Tenerife B
13
1st
Yeclano
15
1st
Mutilvera
Group
Pos.
Team
2
2nd
Langreo
3
2nd
Escobedo
4
2nd
Portugalete
5
2nd
Sant Andreu
6
2nd
Castellón
7
2nd
Getafe B
8
2nd
Arandina
9
2nd
Almería B
10
2nd
Ceuta
14
2nd
Cacereño
17
2nd
Borja
18
2nd
Villarrobledo
Group
Pos.
Team
1
3rd
Racing Villalbés
4
3rd
Alavés B
6
3rd
Orihuela
11
3rd
Ibiza
12
3rd
San Fernando
14
3rd
Plasencia
16
3rd
Náxara
17
3rd
Ejea
18
3rd
Socuéllamos
Group
Pos.
Team
5
4th
Terrassa
7
4th
Alcalá
8
4th
Salmantino
10
4th
Atlético Sanluqueño
15
5th
Cirbonero
17
4th
Tarazona
Matches
Third round
The eighteen winners of the previous qualifying round will be matched by drawing of lots, subject to the fact that those who obtained the best position in the league face those who got worse, disputing the first match in the sports facilities of the latter and avoiding wherever it is possible that they compete among themselves clubs from the same group.
