Buriram United moved into the final of the Thai League Cup after a 1-0 victory over Chiang Rai United on Wednesday night but their coach Masatada Ishii said the Thunder Castle need to plug their leaky defence.
Buriram are seeking a sweep of all three domestic titles and are just one win away from realising their dream thanks to an eighth-minute winner by Theerathon Bunmathan.
The northeastern giants have already won the Thai League 1 and FA Cup trophies this season.
Buriram will take on 2019 champions PT Prachuap in the title showdown on Sunday at BG Stadium in Pathum Thani with the kick-off scheduled for 6pm.
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