Alonso's move to Aston Martin came as a surprise to Alpine and F1 fans alike, which sees him replacing Sebastian Vettel, who is retiring.
Although four-time F1 champion Vettel is retiring at season end, Aston Martin boss Mike Krack has said the German remains committed to the team until he leaves at the end of 2022.
Asked if Alonso remains as involved in the future of Alpine, Szafnauer said: "Absolutely, he's doing absolutely the same.
"He's telling us about the areas where the car felt good and the things that we can improve on and what we should be doing for the next race. We didn't really talk about next year's car yet.
"But yeah, Fernando is fully committed to doing the best he can until the end," Szafnauer said.
Alpine have not named a replacement for Alonso yet, but AlphaTauri driver Pierre Gasly seems to be a leading contender, despite having a contract with his current team for the 2023 season.
The next F1 race is happening this weekend at Singapore on the bumpy and fast Marina Bay street circuit.
Alonso has been victorious at Singapore winning there in 2008 with Renault and in 2010 with Ferrari.
The two-time F1 champion last raced in Singapore in 2018 and finished seventh in his McLaren-Renault.