The English pair should not join the mega-bucks Indian Premier League next year, because their ability to feature in next years Twenty20 showpiece would be limited to a window of just 10 days out of the six-week tournament.
"There is pressure on my team to do well in the IPL next year, because last year we did not get the results we wanted. That was in part was down to players coming and going for international duty," Ganguly said.
"There is a limit with the number of overseas players we can play and a limit to the budget. I don't know how much KP (Pietersen) or Freddie (Flintoff) will be available next year, with the Ashes going on - that's a big competition for them," he said.
"We need players who can play for us for a longer time and gel with the team, not coming and going like that. It is a team sport and last year Shane Warne"s side Rajasthan won through a team ethic, not big names," Ganguly added.
Both England icons have been linked to big-money deals with the Kolkata Knight Riders, owned by multi-millionaire Bollywood star Shahrukh Khan, The Sun reported.