Melbourne skipper Cameron Smith insists his salary-cap drama has not affected him going into the Storm's huge NRL clash with St George Illawarra at Etihad Stadium on Friday.

Smith's deal with pay-television provider Foxtel has come under scrutiny as a fresh round of salary-cap controversy surfaces.

The NRL is investigating the Smith deal, as well as an allegation Gold Coast halfback Scott Prince was having a house built for him for free by a sponsor.

Smith said the question of whether his third-party deal with Foxtel should be included under the salary cap had not been a personal distraction ahead of the top-of-the-table clash with the Dragons.

"I'm a bit over it (the speculation), but it hasn't worried me at all this week," Smith said.

"The club have made sure of it, they're going to work with the NRL on it.

"I've explained and I know Matt Hanson (chief executive) has explained the Fox deal was nothing to do with me signing with Melbourne.

"It was on the table no matter where I was playing football."

Smith is understood to be on a three-year deal worth $45,000 annually - a 2008 agreement coming around the time he re-signed with the Storm.

Melbourne insist they have been liaising with the NRL over the issue for some time - the parties debating whether the money for TV commentary work should be included in the salary-cap.

Prince and the Titans are being investigated by NRL's salary-cap auditor Ian Schubert over an alleged agreement with one of the club's former sponsors to build him a $400,000 house for free.

Gold Coast have emphatically denied the claims.

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