Inter Milan midfielder Sneijder was taken to hospital after suffering an ankle injury in Saturday's 3-0 friendly win over Japan. The problem was not as serious as first feared but the 25-year-old remains a doubt for tomorrow's Group 9 clash at Hampden.
Asked if Sneijder would be fit to play after his side touched down at Glasgow Airport, Netherlands assistant coach Frank de Boer said: "We don't know so we have to wait."
Sneijder trained yesterday but admitted he was unsure if he would be involved against Scotland. De Boer and his players were keen to stress how seriously Holland would be taking tomorrow night's match, despite having already qualified for the FIFA World Cup. "We try to see every game as a very important game, and also this one," De Boer said.
Liverpool forward Dirk Kuyt insisted the match was just as important as his club's UEFA Champions League opener against Debrecen next week, adding: "For me, every game is important."
Defender Glenn Loovens, meanwhile, had no intention of taking it easy on his Celtic team-mates. "We want to win every game, so it's going to be no different tomorrow," said the 25-year-old, who is looking forward to coming up against the club team-mates such as Scott Brown and Shaun Maloney. "It's strange but nice as well. It gives something extra to the game."
Loovens revealed there had been "loads" of banter in the Parkhead dressing room in the build-up to the match, saying of his team-mates: "They've been asking us to slow down a bit but it's not going to happen."
Loovens and De Boer both believe Scotland will miss the suspended James McFadden, the latter adding: "I heard he played pretty well against Macedonia. I think Maloney will play and he's also a very good player."
And despite wanting his country to maintain their 100 per cent record in qualifying, De Boer hopes Scotland still make the play-offs. "I am glad for Scotland they still have a chance," he said. "We're not going to help them but if I could choose, I hope Scotland will go through to the play-offs."