Valtteri Bottas capped off a busy week by recording the fastest time in Friday's qualifying session at the Italian Grand Prix.
It was confirmed on Monday that Bottas will end his five-season association with Mercedes at the end of 2021, with the Finn to join Alfa Romeo.
George Russell will replace Bottas as Lewis Hamilton's team-mate, but before that there is still a world title for Mercedes to fight for, and they secured a one-two ahead of Saturday's sprint race at Monza.
Bottas registered a time of 1:19.555 to finish just 0.096s quicker than defending world champion Hamilton, with current championship leader Max Verstappen rounding off a disappointing session in third place.
It means Bottas will start in pole for Saturday's sprint, which will decide the grid placings for Sunday's grand prix.
Speaking after the hour-long session, Hamilton – who trails Verstappen by three points – said: "Every point counts. Congratulations to Valtteri [Bottas], he did a mega lap.
"It was looking good for us up to then but he went quicker and I couldn't match it.
"We've lost the championship [in the past] by one point. These sprint races can help. The Italian fans are so beautiful, it is good to see them and good to be back here. What an amazing circuit."
Bottas, meanwhile, is looking to capitalise on his efforts heading into the weekend.
"That qualifying lap was nice and it feels good when you get a nice lap in," he said.
"It was good fun and I feel relaxed now everything is sorted for the future. The car has been so good and next year will be exciting for me and I'm looking forward to it.
"I'm expecting to get maximum points tomorrow and then do the best job I can on Sunday."
A frustrated Verstappen reflected on a challenging day for Red Bull, though the Dutchman is confident of improving over the course of the event.
"For us this track is always going to be difficult," Verstappen said. "We struggled a bit in free practice but recovered quite well so we're happy to be third and I hope for the race we can be a bit closer."
Lando Norris and Daniel Ricciardo sealed fourth and fifth on the sprint race grid for McLaren, while Pierre Gasly followed before the two Ferraris, with Sergio Perez and Antonio Giovinazzi completing the top 10 - Sebastian Vettel failing to make it out of Q2.
Valterri Bottas (Mercedes) 1:19:555
Lewis Hamilton (Mercedes) +0:096secs
Max Verstappen (Red Bull) +0:411secs
Lando Norris (McLaren) +0:434secs
Daniel Ricciardo (McLaren) +0:44secs
Pierre Gasly (AlphaTauri) +0:705secs
Carlos Sainz (Ferrari) +0:907secs
Charles Leclerc (Ferrari) +0:955secs
Sergio Perez (Red Bull) +1:056secs
Antonio Giovinazzi (Alfa Romeo) +1:253secs