Seven-times Formula One world champion Lewis Hamilton said both he and his Mercedes team would be in better shape for the second half of the season but the battle with Red Bull and Max Verstappen would be closer and tougher than ever.
The Briton has an eight-point lead over his Dutch rival ahead of the Belgian Grand Prix, a race that starts the second phase and will have plenty of vocal Verstappen fans in attendance.
"It’s going to be close, it’s going to be tough this second half of the season," said Hamilton, who could take a record-extending 100th win on Sunday.
"The first half was definitely one of the toughest and I expect it’s going to be pretty much the same in the second half, if not more difficult."
The 36-year-old said he was excited to get back had missed working with the team and being in the car and did not feel warier of Verstappen's challenge.
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Verstappen has won five races to Hamilton's four so far this year and would be comfortably ahead but for collisions and misfortune that have left him with only five points from the past two races.
"As we've got through the season they have got stronger and stronger," said Hamilton, whose team have won the last seven successive drivers' and constructors' world championships.
"It’s been harder for us as we have gone on, we had a bit of a difficult patch but we got back in terms of operating to how we have in the past.
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"We have definitely upped our game... I have no doubts that we will take another step forward in our processes and how we apply ourselves."
Hamilton's health caused concern at the previous race in Hungary when he feared he might be feeling the effects of 'long COVID' after testing positive for the virus in Bahrain last November.
He was reluctant to divulge personal health information on Thursday but said he had spent the break ensuring he was in better shape and it was no longer a concern for him.
Hamilton has won four times previously at Spa, the longest track on the calendar and one of the fastest, while Verstappen is seeking a first at what was a home circuit before the Dutch Grand Prix was reinstated.