“What’s not to get excited about? I have been watching with a keen eye the team that Johann has put together and the journey they have been on over these last couple of years,” Gleeson said.
“There are a lot of people here that I already know so that was a big factor behind me coming here and I am really looking to build on what Lee has put in place.”
As a player, Gleeson was a two-time Super League winner, making more than 100 appearances for the Wire.
He retired from playing in 2014, having also represented Huddersfield, St Helens, Wigan and Hull.
“We are excited that Martin has joined our journey and we are looking forward to what he will add to this team of ours,” Van Graan said.
Gleeson joins Bath with immediate effect with the club – who have won two out of two Prem matches so far this season – next taking on Gloucester on Saturday, 11 October.
