Kroos featured for 73 minutes as Real Madrid defeated Saudi Arabian side Al-Hilal 5-3 on Saturday.
For Kroos, it was his sixth triumph in the competition; one with Bayern Munich and five with Los Blancos, extending his record as the most successful player in the competition.
The 33-year-old's contract with Carlo Ancelotti's side expires at the end of this season and a decision is yet to be made regarding an extension.
But the former Germany international says he will provide some clarity on his future within the shortest possible time.
"There are different things that you have to think about if you want to continue or not," Kroos said after Saturday's win. "I'm thinking about it.
"It won't take many more months, but there still isn't a decision.
"We are very calm and there is a relationship between the club and myself that nobody does nonsense. I am very calm."
Kroos has also won three La Liga titles and four Champions League crowns since joining Real Madrid from Bayern Munich in the summer of 2014.
