PV Sindhu spoke about fitness and said proper planning and picking the right tournaments will be crucial to succeeding at the Tokyo Olympics.
Gopichand said he always saw the duo as his kids and felt bitter when Saina left his academy to join Prakash Padukone's academy.
India's Kidambi Srikanth and Sameer Verma were on Wednesday knocked out of the Thailand Masters Badminton after suffering first-round defeats in Bangkok.
"From the Rio Olympics to now, my life has changed a lot. I won a lot and I lost some. I have been improving step by step," said PV Sindhu, who is aiming at a second medal in the upcoming Tokyo Olympics.
Saina will begin her campaign against Denmark's Line Højmark Kjaersfeldt, an opponent against whom she has a 4-0 record. Srikanth, on the other hand, will face Shesar Hiren Rhustavito once again in the opening round and would hope to settle the score this time around.
Chennai Superstarz opened their campaign in the fifth season of Premier Badminton League with a dominant 5-2 win over Hyderabad Hunters on Monday.
"There is a lot of competition between us. A lot of rivalry between us. At the end of the day, she does her own things and I do my own," PV Sindhu said.
Momota was among four passengers in a van travelling to the airport on Monday when it crashed into the back of a 30-tonne truck, injuring them and killing the driver of the van.
PV Sindhu suffered a quarterfinal defeat at the hands of Sayaka Takahashi of Japan in a closely-fought women's singles contest to bring curtains on the Indian challenge in the Indonesia Masters.
PV Sindhu will take on Japan's Sayaka Takahashi, who defeated Saina Nehwal by 19-21, 21-13, 21-5, in the second round of the Indonesia Masters.
Kento Momota, who won the Malaysia Masters on Sunday, suffered multiple lacerations to his face and a nasal bone fracture, the Badminton World Federation said.
Three others sustained injuries while the Malaysian driver Bavan Nageswarau died on the spot.
While PV Sindhu will hope to find her rhythm quickly after a loss to Tai Tzu Ying, defending champion Saina Nehwal too will have to quickly get over the defeat to Carolina Marin.
Momota defeated former world champion Viktor Axelsen to win the Malaysia Masters, the first tournament of the BWF 2020 World Tour season.
In an upcoming book 'Dreams of a Billion: India and the Olympic Games', national head coach Pullela Gopichand spoke about how Saina Nehwal had left his academy to join Prakash Padukone's facility.
Sindhu was erratic in the start, failing to capitalise on her leads and eventually lost the first game 16-21 to hand a 1-0 advantage to Tzu Ying.
Saina Nehwal and PV Sindhu produced dominating performances to progress to the women's singles quarterfinals of the Malaysia Masters Super 500 badminton tournament on Thursday.
Reigning world champion PV Sindhu seeded sixth, took just 35 minutes to beat Evgeniya Kosetskaya of Russia 21-15 21-13 in the first round.
World number 12 men's doubles duo of Satwiksairaj Rankireddy and Chirag Shetty fought hard in the first round before going down to world number 19 Ong Yew Sin and Teo Ee Yi of Malaysia.
PV Sindhu will face Russia's Evgeniya Kosetskaya in the first round of Malaysia Masters and she will hope to clash with world number 1 Chinese Taipei's Tai Tzu Ying in the quarterfinals.