The Dutch GP2 driver completed the 2012 season as the Tony Fernandes-owned team's regular Friday and reserve driver, and is reportedly now in the running to replace either Heikki Kovalainen or Vitaly Petrov.
But, although earlier tipped to run an all-pay-driver lineup for 2013, Caterham's financial situation has changed since the Interlagos finale, after Russian Petrov's eleventh place returned the team to the lucrative tenth spot in the constructors' championship.
Petrov's performance may be rewarded with a new deal, or Caterham could use the extra money to keep its highly rated salaried driver, Finn Kovalainen.
The other option remains the well-funded Dutchman, van der Garde.
"We had hoped for clarification last week, but Caterham has moved the decision forwards," the 27-year-old told Dutch magazine Formule 1.
"The decision is theirs and we can do nothing but wait and see," added van der Garde.
"If all goes well, we will know in two weeks."