Both players started Saturday’s 2-0 win over Peru, but the German Football Association (DFB) confirmed on Sunday they have now returned to their clubs.
Chelsea attacker Havertz is ruled out of the Belgium match through illness, while Borussia Dortmund defender Schlotterbeck has a thigh injury.
Germany head coach Hansi Flick has decided against calling up any replacements for the friendly at RheinEnergieStadion in Cologne.
Belgium, who beat Sweden 3-0 in their opening Euro 2024 qualifier on Friday, will be without Real Madrid goalkeeper Thibaut Courtois due to a minor strain injury.
Stay connected with us on social media platform for instant update click here to join our Twitter, & Facebook
We are now on Telegram. Click here to join our channel (@TechiUpdate) and stay updated with the latest Technology headlines.
For all the latest Football News Click Here