Timber suffered a groin injury in Arsenal's 2-1 Premier League win over Everton on Saturday, March 14th, and was forced to miss Sunday's League Cup final against Manchester City, which Arsenal lost 2-0.
Geertruida, a 19-time international, featured in both of the Netherlands' last two FIFA World Cup qualifiers in November, playing 74 minutes in the draw against Poland and 27 minutes in the 4-0 win over Lithuania.
The Sunderland defender was the target of alleged 'discriminatory abuse' in Sunday's Tyne-Wear Derby against Newcastle United, which temporarily stopped the match. Sunderland head coach Regis Le Bris provided an update on Geertruida following the 2-1 win.
"He (Geertruida) looks OK. It is unacceptable, and important to report and manage the situation properly. He looks OK, but we need to support him," he said.
The Netherlands play Norway in Amsterdam on March 27th, four days before facing Ecuador in Eindhoven on March 31st.