German racer Maximilian Gunther will join the ranks of European F3 teams' champions Prema Powerteam for the three races of the season finale at Hockenheim.
Gunther, 18, takes over a seat that was freed up by team regular Brandon Maisano, who quit the championship eight rounds into the season.
Nick Cassidy raced the vacant #24 car at the Portimao and Nurburgring rounds, scoring two podiums, but was not available for the Hockenheim finale due to a clash with the Japanese F3 title decider.
"Gunther has been one of the most surprising rookies of the 2015 season," said Prema boss Rene Rosin.
"He is a bold driver and we saw him win and fight inside the top-10. He will be an added advantage for Prema, giving the team the chance to test a really promising driver."
The German driver's long-time partnership with team Mucke, which saw him finish runner-up in ADAC Formel Masters in 2013 and 2014 and then claim a maiden F3 win at Norisring this year, came to an end in September after the Portimao round.
Gunther, who sits eighth in the F3 standings, has yet to win at Hockenheim, but had claimed pole at the track on four occasions in Formel Masters and finished all three races of this campaign's first visit to the track in the top five.