"Kashyap, Guru, Prannoy and Pranaav returned positive but Saina tested negative," a source in the Gopichand academy said.
Syed Modi International 2018: With marriage on horizon, Saina Nehwal, Parupalli Kashyap insist sport remains priority
Kashyap said: "We have been together for 14 years, so now the wedding and the reception will just be another session to be finished and then we can get back to training."
Russia Open badminton: Sourabh Verma, Rituparna Das enter pre-quarters; Ajay Jayaram bows out in 2nd round
India had a mixed day in office at the Russia Open as six singles shuttlers, including Sourabh Verma and Rituparna Das, progressed to the pre-quarterfinals of the $75,000 BWF Tour Super 100 event
Russia Open Badminton: Ajay Jayaram, four other Indian shuttlers progress to second round of men's singles event
Ajay Jayaram, who finished runners-up at the White Nights International Challenge earlier this month, brushed aside Canada's Xiaodong Sheng 21-14 21-8 in the opening round match to set up a clash with compatriot Subhankar Dey, who got a bye in the first round.
Singapore Open 2018: B Sai Praneeth crashes out in first round; Subhankar Dey, Rituparna Das advance
Sixth seed Praneeth, who has been out of form of late, went down 21-16, 16-21, 18-21 to Igarashi in a match that lasted an hour and 11 minutes.
Orleans Open 2018: India's Parupalli Kashyap, Sameer Verma enter quarter-finals with straight game wins
Kashyap, a Commonwealth Games gold medallist, will face Denmark's third seed Rasmus Gemke, while Sameer takes on another local player Lucas Corvee, seeded eighth.
Sameer Verma through to Swiss Open semis with win over Kento Momota; Parupalli Kashyap to face Raul Must in Austria
Sameer Verma defeated Kento Momota in straight games to enter Swiss Open semi-finals, while Parupalli Kashyap booked his spot in the last four of the Austrian Open on Friday
Indian shuttlers RMV Gurusaidutt, Sourabh Verma and Sameer Verma entered the second round of the Swiss Open World Tour Super 300 tournament after winning their opening round matches on Wednesday.
Thailand GPG: Sai Praneeth, Parupalli Kashyap register easy wins but RMV Gurusaidutt loss hard to digest
Sai Praneeth and Parupalli Kashyap registered easy wins on a day when RMV Gurusaidutt struggled to make an impact in the first round of the Thailand Grand Prix Gold.
Indian shuttlers had good day at the US Open with 6 of them advancing to the singles pre-quarterfinals of the USD 120,000 Grand Prix Gold badminton tour.
India witnessed another fruitful at the Canada Open as all its shuttlers entered the third round of the USD 55,000 Grand Prix badminton tournament.
Indian shuttlers had a good day in office at the Canada Open as RMV Gurusaidutt, Pratul Joshi and Harsheel Dani crossed the opening hurdle to reach the second round of the USD 55,000 Grand Prix badminton tournament, in Calgary.
Nehwal entered the 2nd round of women's singles with an easy win but Sindhu suffered an upset defeat in the 1st round to crash out of the Australian Open.
However, it was end of the road for fourth seed B Sai Praneeth after he went down fighting to Denmark's Rasmus Fladberg 21-15 7-21 21-12.
Guru, who had to endure a series of serious injuries of late, started his campaign with a bang as he brushed aside Malaysia's Ai Wei Jian 21-13 21-9
Commonwealth Games bronze medallist RMV Gurusaidutt and young B Sai Praneeth advanced to the main draw of Singapore Open
Olympic bronze medallist Saina defeated Hana 21-15 21-12 in the women's singles competition at the Siri Fort Sports Complex.
Expressing happiness over the achievements of his wards, Gopichand said Kashyap's win meant a lot for the sport in the country.
Kashyap has a 2-1 record over Wong in official Badminton World Federation (BWF) matches but the last time the duo met, the Indian ended on a losing note.