Lohscheller would not comment on whether the Astra will follow the 308 in offering a full-electric version.
Opel currently sells full-electric versions of its Corsa small car and Mokka small SUV, along with battery-powered commercial and passenger vans.
The Astra ranked ninth in European sales last year in the compact-car segment, with 70,008 sales, a 48 percent decline from 2019, according to figures from JATO Dynamics market researchers.
The segment was led by the Volkswagen Golf, with 283,651 sales. Overall sales were 1,723,367, a 22 percent decline, JATO figures showed. It was the third-largest segment in Europe after small cars at No. 1 and small SUVs at No. 2.
Opel said in 2019 that the new Astra would be built at the brand's home factory in Ruesselsheim, Germany, starting this year. The current Astra is built at Opel's factories in Gliwice, Poland, and Ellesmere Port, England.
Gliwice will switch to producing large vans for Stellantis this year, while the future of Ellesmere Port is still the subject of discussion between Stellantis and the British government, which is reportedly pushing for the company to build electric cars there.
A decision depends on the size of UK government support, Stellantis CEO Carlos Tavares said in March.
Lohscheller described the talks as "constructive" and said he hoped they would be concluded soon. "Hopefully we can wrap this up as quickly as possible. I think the sooner the better for everybody," he said.
A future full-electric Astra could potentially work for Ellesmere Port given that it would probably be built on Stellantis' coming e-VMP architecture for full-electric vehicles. The architecture is a derivative of EMP2, which does not support a full-electric drivetrain.
The Astra launch is the next focus for Opel after this year's rollout of the Mokka small SUV, which is based on Stellantis' CMP platform and comes with an electric variant.
The Mokka has introduced new design elements for Opel/Vauxhall, including a flat, stretched "Vizor" grille and an elongated digital dashboard created from merging two screens, that are expected to be continued in the Astra. Spy shots of the hatchback version undergoing testing appear to confirm the Vizor face.
The plug-in hybrid version of the Astra is expected to have the same specifications as the 308 equivalent, meaning two power levels.
The sportier 308 plug-in hybrid will offer 225 hp by mating 180-hp gasoline engine and 81-kilowatt electric motor; while a cheaper version will offer 180 hp from a 150-hp gasoline engine and the same 81-kW electric motor. Peugeot says the 308's electric-only range is 60 km (37 miles), pending final WLTP certification.