Glock keeps ‘eyes open’ amid season at the back
The German revealed earlier this year that he opted to switch to Virgin even though Renault and Sauber were also options.
Glock, 27, said that at the time he made his choice, the futures of the aforementioned teams looked much dicier than Virgin's, the struggling new British team.
"I'm keeping my eyes open," he is quoted by Auto Bild Motorsport, in a report that also said Force India was an option for the former Toyota driver.
Glock admits life at the back of the grid has been "hard".
"You can't think to yourself, 'oh, I could be sitting in that car now!' The situation is what it is and you have to make the most of it, otherwise you can't perform to your best.
"So I try to ignore the other 18 cars. For me it's a world championship with Lotus, and simply that is how I motivate myself," he explained.