Manually edit the "setting" file located in:
FIFA 14\Game\dlc\dlc_footballcompeng\dlc\footballcompeng\data\compdata.
every "match_stadium,xxxx" is a stadium setted.
Just look at the one in the patch to understand how to do it.
This is WC 1990
6,asset_id,1990
6,comp_type,CUP
6,rule_numsubsbench,5
6,match_matchimportance,100
7,match_stagetype,LEAGUE
7,match_matchsituation,GROUP
7,standings_sort,POINTS
7,standings_sort,GOALDIFF
7,standings_sort,GOALSFOR
7,standings_sort,WINS
8,num_games,1
8,match_stadium,157
8,match_stadium,386
8,info_color_slot_champ_cup,1
8,info_color_slot_champ_cup,2
9,num_games,1
9,match_stadium,343
9,match_stadium,344
9,info_color_slot_champ_cup,1
9,info_color_slot_champ_cup,2
9,info_color_slot_euro_league,3
10,num_games,1
10,match_stadium,90
10,match_stadium,385
10,info_color_slot_champ_cup,1
10,info_color_slot_champ_cup,2
11,num_games,1
11,match_stadium,5
11,match_stadium,348
11,info_color_slot_champ_cup,1
11,info_color_slot_champ_cup,2
11,info_color_slot_euro_league,3
12,num_games,1
12,match_stadium,345
12,match_stadium,384
12,info_color_slot_champ_cup,1
12,info_color_slot_champ_cup,2
12,info_color_slot_euro_league,3
13,num_games,1
13,match_stadium,338
13,match_stadium,354
13,info_color_slot_champ_cup,1
13,info_color_slot_champ_cup,2
13,info_color_slot_euro_league,3
14,match_stagetype,KO1LEG
14,match_matchsituation,ROUND16
14,match_endruleko1leg,ET
14,match_endruleko1leg,PENS
15,num_games,1
15,match_stadium,90
16,num_games,1
16,match_stadium,345
17,num_games,1
17,match_stadium,385
18,num_games,1
18,match_stadium,157
19,num_games,1
19,match_stadium,344
20,num_games,1
20,match_stadium,5
21,num_games,1
21,match_stadium,343
22,num_games,1
22,match_stadium,348
23,match_stagetype,KO1LEG
23,match_matchsituation,QUARTER
23,match_endruleko1leg,ET
23,match_endruleko1leg,PENS
24,num_games,1
24,match_stadium,386
25,num_games,1
25,match_stadium,157
26,num_games,1
26,match_stadium,5
27,num_games,1
27,match_stadium,343
28,match_stagetype,KO1LEG
28,match_matchsituation,SEMI
28,match_endruleko1leg,ET
28,match_endruleko1leg,PENS
29,num_games,1
29,match_stadium,343
30,num_games,1
30,match_stadium,90
31,match_stagetype,KO1LEG
31,match_matchsituation,THIRDPLACE
31,match_endruleko1leg,ET
31,match_endruleko1leg,PENS
32,num_games,1
32,match_stadium,344
33,match_stagetype,KO1LEG
33,match_matchsituation,FINAL
33,match_endruleko1leg,ET
33,match_endruleko1leg,PENS
34,num_games,1
34,match_stadium,157