He made his debut at 16 in January 2014 and, most famously, scored against Oxford United to help secure the Football League trophy with a 2-1 victory at Wembley in 2017.
During this season, he has scored nine times in 36 games with Coventry.
He left to join the Foxes later that year, signing a three-year contract, but is now one of eight players who will leave when their contracts expire at the end of this month.
Thomas was an unused replacement for Leicester three times when Claude Puel was in charge, but failed to break through in the seniors.
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He spent last season on loan to Scunthorpe United.
And after captaining the Foxes U23 during the first half of this tenure, he spent the second half of the campaign on loan from Alan Pardew’s ADO Den Haag, until the 2019 tenure. -2020 is shortened in the Netherlands.
The 23-year-old now finds himself a free agent looking for a new club.