Only Gavin McCann is out of contract this summer and even he has been offered the chance to earn a new deal when he is fully recovered from an ankle injury, which has restricted his appearances since Coyle's arrival from Burnley in January.
Coyle's predecessor Gary Megson tried unsuccessfully to offload some players, including McCann and the likes of defender Danny Shittu, to generate funds to improve the squad.
But the current manager insists he does not need to sell in order to strengthen.
"I've said to Gavin when he is fit I'll give him an opportunity to win a contract, which we've not been able to do now because he has been injured. But it is only fair he has an opportunity," said Coyle.
"There might be one or two that feel they have not been given an opportunity to play or feel they will not get a lot of match time, but they are still under contract.
"Therefore it would take someone to come in and be interested in them for them to move on.
"I think it is fair to say we will look to add a few players to the existing squad because we want to take the club forward.
"That takes a number of things to come to fruition: one, they want to join; two, the finances are in place; and three, they need to be available.
"We managed in January to bring three lads (Arsenal's Jack Wilshere and Manchester City's Vladimir Weiss on loan and Houston Dynamos' Stuart Holden) in without spending a penny - I'm not saying that will be the case in the summer.
"We have targets in mind and we have to do our best to really entice them to the club.
"But I don't need to sell anyone."
Source: Team Talk
Source: Team Talk