There is speculation Haskell, who can cover all three loose forward positions and was one of the few English players to enhance his reputation (on the field, at least) during the World Cup, is in the Highlanders' sights.
Haskell is playing in Japan until the end of the New Zealand summer but does not then rejoin his English club, Wasps, until late 2012. He has made it clear he wants to play in the Super 15, and the Highlanders are still in the market for another forward.
Clark is aware of Haskell's desire to broaden his horizons but is not sure how the Englishman could end up with the Highlanders.
"I've got no idea at this stage. I know he's shown an interest in playing in New Zealand ... He's not on the list of available players at the moment so we can't pick him."
Clark said the New Zealand franchises could fill the final holes in their squad only through players contracted to provincial unions by 5pm today.
Overseas players can be directly contracted to the franchises, but it is an expensive option that has not yet been utilised by any of the five New Zealand teams.
"We did look at it but it's fairly difficult to get an overseas player in the budgets we operate under," Clark said. "We thought, with the World Cup on here, there might be a few that would be interested.
"But it doesn't seem any of the franchises are going to look at overseas players."
Haskell played seven seasons for Wasps before joining French club Stade Francais, and then inking a one-year deal with the Ricoh Black Rams.
The 39-test veteran told the Sunday Times earlier this year he was keen to experience the Super 15.
"We've always seen it from up here as an amazing event, something special. People say that the Crusaders-Sharks game at Twickenham was one of the greatest ever. I would love a season in it. I would just soak it all up.
"I want to go to a competitive side that can win the title. I am not motivated by just turning up and playing."
Haskell played well during the World Cup but blotted his copybook when he and two team-mates were reprimanded for making inappropriate comments to a Dunedin hotel worker.
