20 call centre jobs at risk in Londonderry
The company has three call centres in Northern Ireland employing 500 people.
Sixty staff at the Belfast base are also at risk of loosing their jobs.
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Hide AdThe company confirmed that the potential redundancies followed decisions by two of its clients not to renew contracts.]
A spokesperson for Gem said: Strategic decisions taken by two of our clients not to renew contracts have resulted in a reduction of our workforce.
"Our staff have been informed and we are currently involved in a consultation period.
"We remain committed to doing business in Northern Ireland and will continue to source new opportunities to retain staff and also retrain where possible."
The company said previously announced three-year expansion plans had now been delayed.