England are top of Pool B after victories over Argentina and Georgia in their first two games, with fixtures to come against Romania in Dunedin on Saturday and Scotland in Auckland next Saturday.
“Romania are going to be similar to Georgia,” says Tuilagi, who scored his first World Cup try in the 41-10 win over Georgia.
“They are very physical, direct and for us we have to focus on the contact and our discipline.
“It is going to be tough but hopefully it will be a good game.
“The fans have been awesome. We met some at a signing session. They have come all the way to watch us so it is nice to give something back. It’s awesome.
“Do I have a message for England fans? Keep believing,” he told Rugby Media.