Patrick Wilson has confirmed his 'Ant-Man' casting.

'The Conjuring' actor was careful not to reveal whether he will play the protagonist or antagonist saying, ''I can't tell you'', but admitted his role was ''important'' when he spoke at the South by Southwest festival (SXSW), in Austin, Texas.

Wilson was also quizzed on whether or not he tried on a costume for the forthcoming Marvel superhero movie - is set to begin filming in April - and he said, ''No.''

The 40-year-old actor will star alongside Paul Rudd who will play Scott Lang, the new incarnation of Ant-Man, and Michael Douglas who will star as Hank Pym, the original Ant-Man who discovered the scientific technology which affords the hero his powers.

The film is being directed by British filmmaker Edgar Wright, who also co-wrote the script with Joe Cornish, and follows the adventures of a superhero that can shrink himself down to insect size.

Kevin Feige is producing 'Ant-Man' which is expected for a July 2015 release.