Alexander Sims will continue with Carlin's GP3 team for this weekend's round at Monza.
The 24-year-old won the sprint race at the last round at Spa after being called up to drive alongside regulars Nick Yelloly and Luis Sa Silva. He will again replace Eric Lichtenstein in Italy, after the Argentinian's contract with Carlin was terminated due to the non-appearance of payments from his management.
Team boss Trevor Carlin praised the contribution Sims made in Belgium and believes he has galvanized the other drivers.
"Alexander did a fantastic job for us at Spa and is the epitome of a professional racing driver in his ability, feedback and attitude," he said.
"To see him and Nick pushing each other on was a great help for the team and we have an even better handle on the car now. We head to Monza chasing similar if not better results for them both and Luis."
Sims, who raced for the Status team at the Nurburgring GP3 round, has also made appearances in European Formula 3 for T-Sport alongside his role as a factory McLaren driver in this year's Blancpain Endurance Series.