Watford are reportedly keen on signing Mariappa from Crystal Palace.
The 28-year-old centre-back, who is also able to play on the right side of defence, started his career at Hertfordshire, going on to make 245 appearances for the club having made his debut in 2006.
He featured 25 times in the 2006/07 season for the Hornets in their last Premier League campaign, and secured a move to Reading in 2012. He stayed there for just one season, moving to Crystal Palace in the summer of 2013, and has so far featured 42 times for the London club.
However, he has only been a bit-part player this season, and since Alan Pardew’s appointment he has been something of an outcast. Mariappa has played just 16 games this term, including just 60 minutes of football across the last seven fixtures.
This has opened the door for a potential exit from Selhurst Park, with the Hornets first in line for his signature.
He has shown to be an adept top level defender, and his ability to play in both the centre and right of defence would allow him to easily transition between a back-three and back-four that Watford utilise.
He is also a former captain at Vicarage Road, and will likely have no qualms with returning to Hertfordshire should the option arise.
Mariappa could be the second Palace player to secure a transfer to Watford this summer, with Algerian midfielder Adlene Guedioura expected to join the club on a permanent deal after enjoying an exceptional loan spell with the newly promoted Premier League side this season.