Michael Bradley admits he feels the pressure of expectations at AS Roma.

The former Chievo Verona midfielder has impressed in preseason for Roma.

"I do feel the pressure of having to prove I'm worth the investment the club have made in me and prove that they've made the right decision," said the USA international.

"I want to succeed at Roma as I view it as an important test. I don't want to disappoint them and I don't want to let down my teammates or the fans."