The Swiss have been beaten by Costa Rica, Uruguay and Norway since qualifying for the tournament in South Africa. They will be looking to turn their fortunes around before they open their World Cup campaign against European champions Spain, and Barnetta believes there could be no better opponent for them to beat than the defending world champions.
"This is going to be a real test for us, but I think it is pointless playing against the so-called small nations just to build up self-confidence," he said. "We have got to play well against strong opponents - that is what gives you self-confidence."
The Bayer Leverkusen midfielder believes the best way to beat the Italians will be to surprise them.
"We have got to become more unpredictable," he said. "And we can do this by switching positions more often. We also should try and find the way to goal quicker and maybe even try a few long-range efforts, especially with this ball."