Martin Johnson has warned against people expecting too much, too soon, from Andy Farrell in rugby union.
The Great Britain rugby league captain is on the verge of signing for a Premiership club - believed to be one of Leicester, Wasps or Northampton - but Johnson believes it will take him some time to adjust to the different demands of the union game.
The 29-year-old Wigan star is being touted in some sections of the media as the answer to England's current problems, but Johnson dismisses such a notion.
''If he wants to come to union then good luck to him but it is a brave decision,'' Johnson told BBC Five Live.
''Someone asked me the other day whether he is going to be the answer to England's leadership problems and I couldn't believe the question.
''He has not even played a game of rugby union as far as I'm aware.
''If he wants to come he has to develop into a rugby union player first and I'm sure he has the ability to do that.
''Then you look at going beyond that and seeing if he can play at international level.''
England flanker James Haskell insists he will be pushing as hard as possible to be back from a toe injury in time to make his case for a spot in Eddie Jones' side looking to defend their RBS 6 Nations title next year.