The Magpies will put their poor league form to one side when they face Sheffield Wednesday in an attempt to edge closer to Wembley.
The Dutchman sees the Magpies as having a big chance to win their first silverware in several decades if they can negotiate their home fixture with the Owls, but admits that the way the draw pans out for each round can play a major part in their hopes.
“We can do well in the Capital One Cup but you need a bit of luck with the draw," he told the Chronicle.
“It is a big opportunity this season. The club want to win prizes and the cup is a big prize. We have to prepare right and go for it.
“The cup goes quickly and we could be in the final 16 if we win against Sheffield Wednesday.
“It is a really important game for us. We have a big week ahead and we have to be ready.”
The Magpies are yet to secure a win in the Premier League this season having drawn two and lost four of their opening six fixtures. The only win they've secured since the campaign kicked off was in an earlier round of the cup against League Two outfit Northampton Town, with Janmaat scoring his first goal of the season, a tally he added to with a strike against Watford at the weekend.
Steve McClaren's men will be facing a stronger outfit in Championship side Wednesday this time round, with the Yorkshire team currently mid table in England's second tier, but Newcastle fans will be expecting nothing less than a victory taking into account the former England manager's assertion that he wanted the club to challenge for a trophy when he took over in the summer.