Rodgers' team kick off their Barclays Premier League campaign at home to Stoke in six weeks' time; Mignolet has been impressed by the rapid transfer business already conducted.
"From the talks I had with the manager and the goalkeeping coach I felt they were very ambitious and the club wants to get forward," Mignolet told liverpoolfc.com.
"The signings they'd already done before July showed they really wanted to get going. They want to push on again in the Premier League. It was obvious that they are an ambitious club and a big club.
"I know how big a club this is but I think I'm only going to feel it once the games get going. The first few training sessions went okay. I'm very happy to be here and train."