Abstract: The purpose of this study is to investigate the effects of small-sided games on offensive effectiveness using tactical periodization in youth football training. A pre and post control group design with two-group used with a sample of 64 football players from Kuala Lumpur. They were divided into an experimental group (n = 32) and a control group (n = 32). Over six weeks, the experimental group was given a small-sided game training using tactical periodization intervention. In contrast, the control group was given a traditional training program specific to football intervention. The sample performs offensive actions in 4 vs 4 SSGs. All participants played four minutes in both situations, and the field size was 30 m x 40 m. The system of Tactical Assessment in Football (FUT-SAT) used for data collection and analyses. Analysis of Covariance (ANCOVA) was used to investigate the effects of small-sided games on offensive effectiveness using tactical periodization by controlling for covariates (preoffensive scores). Data were analyzed using SPSS for Windows®, version 20.0. Results indicated that there was a significant effect of intervention on the offensive aspect between experimental group and control group after intervention, F (1, 61) = 451.103, MSE = .958, p = .000, partial n2 = 88 by controlling for covariate effect (pre-offensive score). These findings can help coach in better selecting the type of SSG drills according to the purpose of the training session, concerning players' tactical development. Future research should consider different youth levels to ascertain whether such behaviour are similar in players of different ages and sports level.