Tottenham Hotspur picked up their first win of the season on Saturday.
Tottenham looked set for a second successive draw in the Premier League, after last weekend's 1-1 stalemate at Everton on the opening day of the campaign.
However, Victory Wanyama popped up with an 83rd-minute winner at White Hart Lane on Saturday to get Spurs up and running in the competition.
It was the Kenyan's first goal since joining Tottenham from Southampton this summer, but the Argentine has reserved praise for another of his pre-season signings - Janssen.
The 22-year-old, who joined the Lilywhites in a £17 million switch from AZ Alkmaar, played the full 90 minutes after impressing against Everton off the bench.
And the Argentine manager has praised the Dutchman's fighting qualities, even if he was not on the scoresheet.
"I am happy with Vincent Janssen, he was fantastic and created a lot of chances," he said via BBC Sport.
"I am happy with the way he works and fights, the supporters see he is a fighter."
Janssen started up front in a number nine role as Harry Kane - who won the Premier League's Golden Boot last season with 25 goals - started in a slightly deeper position.
Everton manager Ronald Koeman (R) and Tottenham manager Mauricio Pochettino