But asked by GPFans Global as to what it will come down to, that he does not know already about either driver that will help him determine who should land the seat, Wolff replied: "I hope one day I wake up and it becomes clear.
"I think we need to look into the season, how the next races unfold, and then it is a judgment call, I believe. Not a very scientific response, but I haven't got any at the moment."
Wolff has stated this year that it is his intention to confirm his driver line-up by as early as the August break after being stung last year by the delay in the negotiations with Hamilton that did not start in earnest until after Christmas.
The seven-time F1 champion finally put pen to paper on a one-year deal in January.
Wolff has confirmed that no new negotiations have yet started with Hamilton, but that early discussions have at least commenced, and the signs are encouraging.
"I wouldn't say we have gone back and forth but at least we have learned our lesson that we wouldn't leave it until the Christmas holidays," added Wolff. "That was definitely taking it too far.
"We are in a very good place, our relationship is growing stronger, like every year, and it's about time to give it a little nudge and start to speak, and this is what we are going to do soon."
What do you think?
Maybe Hamilton is already thinking that he may need another chance to get the 8th WDC as Vestappen is such a threat this year.
GPFans is a multi-platform, multi-language brand dedicated to Formula One coverage. We bring you all the ins and outs of the sport, 24/7, everything from up-to-the-minute news and features to the latest viral stories and clips.
We believe that a new generation of exciting, outspoken drivers will make F1 more popular than ever before, and we want to give our users access to as much of their heroes as possible, on and off the track. From Lewis Hamilton to Max Verstappen, Daniel Ricciardo to Sebastian Vettel, we provide in-depth analysis of every every Grand Prix in the season, from Australia to Abu Dhabi.
With Formula One under the new ownership of Liberty Media, how the sport is being covered is evolving, and GPFans will look to be at the heart of this progression into new media, as one of the fastest-growing sites covering the king of motorsports.