Former Newcastle defender Daryl Janmaat starred for Watford on Monday night.
Could Koeman be set for a third Premier League club in Swansea, after spells at Everton and Southampton?
We preview Burnley and Watford's predicted line-ups ahead of their Premier League contest.
The Dutch international left Newcastle for Watford during the summer for £7.5m.
Watford's Daryl Janmaat has discussed his exit from Newcastle United.
Daryl Janmaat left relegated Newcastle United for Watford in the summer.
Newcastle sold the pair to Watford and Liverpool respectively this summer.
As part of our analysis of the Premier League transfer window we take a look at Watford FC.
Some West Ham United fans have expressed their disappointment at missing out to Watford for Daryl Janmaat... but Newcastle United fans beg to differ.
The Dutchman has made a swift return to the Premier League.