Fiat SpA (F.MI) Chief Executive Sergio Marchionne is meeting with advisors and German government officials up until Wednesday, when it will submit a non-cash offer for General Motors's (GM) German unit Adam Opel AG, a person familiar with the situation said Monday.

"The plan that Fiat has been drafting with its advisors doesn't include plant closures in the European countries where the U.S.-based carmaker is currently operating," the person said, adding that Fiat is not going to offer any cash to General Motors for its European operations.

The industrial plan drafted by Fiat also includes the reduction of models produced by GM Europe units Opel and Saab, the person said.

In the last four weeks, Marchionne has been traveling extensively to the U.S. and Germany in an attempt to ink a three-way merger between Fiat-Chrysler and General Motors' European operations.

The person said Marchionne is personally involved in drafting the final details of the plan, constantly adding or removing elements until the very last minute.

Fiat wasn't immediately reachable for a comment.

-By Sabrina Cohen, Dow Jones Newswires, +39 02 5821 9906; sabrina.cohen@dowjones.com