He told the Bristol Rovers club website: "I am a tough tackler and good at passing the ball, and have scored a few for the youth team at Leicester."
Irish-born Bolger could start against Hartlepool in League One on Tuesday.
"I had my first training session today and the lads were very welcoming. I cannot wait to be involved tomorrow night," the 6ft 4in defender added.
"I'm looking forward to making my league debut and getting as many senior games under my belt as possible."
Bolger was named Leicester's academy player of the year in 2009.
Source: BBC Sport