Giroud has only started six Premier League games under Maurizio Sarri this term, scoring just once, but he has thrived in the UEFA Europa League.
The France international hit a hat-trick in a 5-0 away win against Dynamo Kiev last week to book Chelsea's place in the quarter-finals.
Giroud's nine goals is more than any player in this season's Europa League but he was back on the bench for Monday's (AEDT) 2-0 Premier League loss at Everton.
Lyon president Jean-Michel Aulas has named Giroud as a transfer target and the 32-year-old suggested he could be keen on the move.
"I can imagine a return to France. We do not know what the future will hold," he said in an interview with Progress.
"This is not my priority at the moment, but I will be open to all proposals because I am happy when I play.
"I am very happy with the interest of some French clubs. Lyon was mentioned because the president talked about it.
"It's a club with very good young people, very good players, a very good staff. Lyon is a very good club, a great team, like others in France."