Son was forced off in the latter stages of the North London derby at Arsenal last weekend due to a minor issue, while Maddison jarred his knee before his withdrawal.
There was initially concern surrounding Maddison considering the impact on his joint, but a scan earlier this week is believed to have brought good news.
Maddison and Son were able to train alongside their teammates on Friday, but Postecoglou stopped short of guaranteeing their involvement against the Merseyside giants this weekend.
Summer arrival Brennan Johnson, meanwhile, is a definite absentee due to the issue that he picked up in the 2-2 draw with Arsenal at the Emirates Stadium.
«Brennan will miss out this week,» Postecoglou told Tottenham's official media. «It's nothing too serious but it is enough to keep him out (of the Liverpool clash).
»Madders and Sonny trained today but we will see they how they pull up from training but they both got through everything we needed them to get through, but it will depend on how they pull up."
Maddison has been in impressive form for Spurs this season following his arrival from Leicester City, scoring twice and providing four assists in seven appearances in all competitions.
Son, meanwhile, has scored five goals in seven appearances, including both of Tottenham's efforts in the draw at Arsenal.
Spurs will be aiming to continue their unbeaten start to the new Premier League season this weekend, with the capital outfit currently fourth in the table on 14 points.
«They (Liverpool) probably bring something different from any other team in the league in
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