After their energy-sapping Good Friday win over Middlesbrough, Rasmussen's late equaliser salvaged a hard-fought 2-2 draw for Nuno Espirito Santo's men, who now have three huge games inside the next eleven days, during which they will hope to close in on promotion.
Saiss, whose full-time reaction at the Riverside epitomised the effort that Wolves had put into their 2-1 over Middlesbrough, said:
"Hull was a hard game. I think looking at the circumstances, it's turned out to be a good point, but we can still have regrets. We didn't control the game well enough in the first half when we were in front - if we had, the game would have been easier for us.
"We had a tough game on Friday and that may have played a part. To play nine against eleven was tough, and then to have another game today was hard again.
"However, we can't use this as an excuse. Every team is tired, because this is the Championship and it's the toughest league in the world."
Wolves had led early on through Diogo Jota's penalty, but the visitors turned the game on its head and looked to be heading for three points with ten minutes remaining.
However Buur, who had earlier replaced Jota and was making his first league appearance for Wolves, levelled things up with a calm header seven minutes from time. Saiss believes that the strength of Nuno's squad will be vital during the run-in.
"Every player has been good this season - those who start and the substitutes," he added. "I'm very pleased for Oskar because the manager chose to put a young player onto the pitch and he did very well and scored.
"All of our players will be important between now and the end of the season."
Attention now turns to Friday's game at Cardiff, when the division's top two sides will lock horns. Wolves follow that up with home games against Derby County and Birmingham City, and Saiss says that the coming days are among the most important of the 46-game season.
"It's vital that we recover now, because we have a big game on Friday that we want to win - we want to keep Cardiff away from us," he continued.
"Then after that we have Derby and Birmingham at home, so we have to prepare well for such a big period.
"We are all focused on our objective - we train every day in order to be able to play two games in a week, because that it what the Championship demands. We've played 40 games and we have six left - we can't switch off or stop what we've been doing because we're tired.
"We are strong mentally - stronger than last season - and that makes a big difference. We have to keep this mentality because our objective all season has been the same, and now we want to achieve it."