David Marshall expects to stay with Cardiff City in the Championship next season.
The Scotland goalkeeper has been linked with Tottenham.
"We haven't done enough to stay up and the boys are gutted," he said. "We expected a lot more (from ourselves) so you can imagine how disappointed we are. Everyone is devastated and it is going to be a hard couple of weeks getting our heads round it.
"But the manager has asked us to do that and come back stronger and that is important. We've got a squad that won the Championship pretty comfortably so we need to get our heads right and make sure we start well next season.
"We can come back, for sure. We have added players, better ones than we had last season, but our attitude needs to be right. It is disappointing now but we all need to go away in the summer and pick ourselves up when we get back.
"I don't think we have lacked fighting spirit but we have come up short and not been good enough in games, so there can be no complaints. We just have to stick together and be ready to go again."
