Injection-recovery test performed on the TESS PLD light-curve residuals from sectors 55 and 56 of TOI-3568 to check the detectability of additional planets in the system. High and low recovery rates are presented in light yellow-green and dark-blue colors, respectively. From this detectability map, we can conclude that the existence of additional planets with radii ≳4.0 R_⊕ and periods ≲25 d should be excluded, given that the recovery rates range from 80 to 100%. However, small planets with sizes ≲4.0 R_⊕ would remain undetected for almost the entire set of periods investigated.