Preston have turned down offers for Andy Lonergan, Billy Jones and Sean St Ledger as they battle to stay in the Championship.
Cardiff lodged a bid for goalkeeper Lonergan over the weekend, while Ipswich were eager to sign defender St Ledger.
Bristol City also made an improved offer for the versatile Jones, but Preston chairman Maurice Lindsay rejected all three proposals.
Lonergan, St Ledger and Jones have established themselves as integral members of the squad at Deepdale in recent seasons and Lindsay insists he was never tempted to sell.
Preston are currently languishing at the bottom of the Championship table and Lindsay wants them to have the best chance possible to beat the drop.
Trying to strengthen
"We turned down a big bid from Bristol City for Billy, that was an improved offer from one they made earlier," Lindsay told the Lancashire Evening Post.
"Ipswich wanted to sign St Ledger and we said 'no'.
"We also turned down a bid from Cardiff for Lonergan - they didn't have the confidence to ring us up, we got a fax from them.
"This shows we are not a selling club, we are trying to strengthen in our battle to avoid relegation.
"We want to turn the ship round here, give ourselves the chance of staying in the Championship."