Bolton manager Gary Megson believes his current squad would get relegated if he didn't improve it in the summer.
The Trotters finished the season in 13th place in the Premier League after a tame 1-0 defeat at Manchester City on the final day of the season.
Bolton succumbed to an early Felipe Caicedo strike on eight minutes and despite coming to life later in the first half they ended the season on a sour note.
Megson's options have been limited this term and he knows that he will need to add to his squad before pre-season if Bolton are to avoid the drop next season.
"We have got to have more choice as a squad and we have to bring the quality up," he said.
"We just had an end of season debrief and in terms of people you couldn't get any better.
"We have to mend and make do. We have used 18 players all season and yet they have done it without complaint.
"At times we have played badly but we have given it a great effort."
Despite his concern Megson is confident he can bring the right players in although he envisages a busy summer ahead.
"I think we can get the players in. Our club has an awful lot going for it, we have just finished 13th," he added.
"We're going to be in the same market for players, competing with the same clubs. I can guarantee whoever we go for Fulham will be going for them, Wigan will be going for them, Sunderland and Hull City, but we have to stay ahead.
"I'm not being disrespectful but one of the 18 players we have used is Chris Basham who was on loan at Rochdale and wasn't deemed good enough for that level.
"Kevin Nolan has gone to Newcastle as well. You look at our bench compared to City's. We can't go through a season like this again because we would really struggle.
"We have got the nucleus of a squad here. We are down to a squad that would get relegated if we don't improve it but we will improve it."
Megson was unconcerned with his side's poor performance at the City of Manchester Stadium and put it down to a bad day at the office.
"We played without our usual intensity and we were slow to second balls," he highlighted.
"We were probably five to 10 per cent down on what we expected to do. I don't think we played particularly poorly."