Spurs' new midfield addition was presented to the home support before kickoff yesterday.
Asked about the Dutch after the loss, Frank said: "It’s fair to say we didn’t defend as well as we should do and we have done in the first three games. That I am quite confident we will come back to defend well again but that could have helped massively.
"The creativity, yes, that’s why we signed Simons to have an extra offensive player but I also think on the day with all due respect to our offensive players none of them hit a high level and that happens sometimes. I’m very aware. I don’t want to say it’s okay but it’s natural."
Asked if he is excited to work with Simons, Frank also stated: "Yeah, yeah, very excited, very happy that we signed him. I think it was a great signing from the club. He can play 10 or left winger, those are the two main positions.
"I think he can bring on a day where I can say our structure building up and all that because it's not only about that, then sometimes you need a player that can do something (clicks his fingers) a little bit out of nothing, go past the player, produce a cross, a shot, a pass, with that extra quality that you need on the day, and that's what I think he can bring."