Janssen has struggled to make an impact at Spurs with the majority of his 27 appearances coming from off the bench.
However, even in starting matches his record in front of goal is poor and all of his four goals have come from the penalty spot.
The 22-year-old is doing his best to remain positive. He always knew it was going to be a challenge moving to the Premier League with just one season of top-level football behind him.
“I have given myself at least a year to succeed and it’s not over yet,” he told De Telegraaf.
“I’m still young and, before I came here, I had played at the highest level only a year. I will fight with everything that is in me. Then we see.
“In training I feel I’m getting better, but match practice is the only thing I do not have at this time. I try to compensate by giving all in training. I do what I can.”
Janssen was the subject of transfer rumours during the January window, but Spurs indicated they were not interested in selling and the forward himself says he never considered leaving.
“At one point I was asked if I was open to another club but that has never been an option for me.
“I’m only here for half a year and can still develop well myself. I agree with Gini Wijnaldum, it’s a very different intensity here. You feel that it is physically stronger. They are all great players and the level is very high.”