Johnson and McCormack were Cardiff's two key players last term
Boss Dave Jones sympathises with Roger Johnson and Ross McCormack after the Cardiff City duo signalled their desire for a move to the Premier League.
On Wednesday the Bluebirds accepted a bid from Birmingham City for centre back Johnson, which is understood to be in the region of £5m.
Top scorer McCormack has publicly stated that he would "like to give the Premier League a chance".
"People must remember playing football is their livelihoods," Jones said.
Cardiff chairman Peter Ridsdale had confirmed that "Roger would like to talk to a Premier League side", following the Bluebirds' disappointment at missing out on a Championship play-off place.
Wales international and Bluebirds captain Joe Ledley is another one of Jones' players who has caught the eye of top-flight clubs.
Stoke City have had £6m bids for Ledley rejected by the Championship club, while he the 23-year-old midfielder has caught the eye of Wigan Athletic, West Ham United and Scottish club Celtic.
But as Ledley has only a year left on his Cardiff deal, his potential valuation has probably decreased.
Jones said Cardiff have had no bids for Ledley and Scotland international striker McCormack, who scored 21 league goals last season, while newly promoted Premier League side Birmingham appear to have got their man in Johnson.
I hope players like Roger stay but in football you never know. If players do leave we'll have to make sure the deal is right for Cardiff City
Cardiff City manager Dave Jones
"Everybody has an ambition to play in the Premier League," Jones told BBC Sport Wales.
"And if an opportunity comes up they'll want to take it, you must remember it is their livelihoods and at the moment they're not plying their trade in the division that they want to play in."
Jones has been forced to sell many of his best players to bigger clubs over the years.
Aaron Ramsey has left for Arsenal, Cameron Jerome to Birmingham, Chris Gunter to Tottenham, Michael Chopra to Sunderland - before his return last season - and Glenn Loovens to Celtic.
Cardiff, who Ridsdale insists need to "sell one player a season to survive" have recouped more than £15m in transfer fees in Jones' four-year Bluebirds reign.
"We always have the problem of players leaving us and wanting to play in the Premier League," said Jones.
"I hope players like Roger stay but in football you never know. If players do leave we'll have to make sure the deal is right for Cardiff City.
"We've a reputation for bringing players in from smaller clubs, coaching and developing them to become better players.
"But unfortunately we're not in the division they all want to play in and the bigger clubs come calling.
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