The Magpies allowed Yohan Cabaye to join Paris Saint-Germain in January, and have struggled in the Premier League since then after failing to add to their squad.
"We have limited resources at the moment and when we lose one or two key players it hurts the team badly," Ameobi told BBC Newcastle. "That is something the club have to put right for next season.
"We need quality players and we need a quality squad as well.
"This has all been brought out to a lot of people but we, as players, knew that. I think the fans are getting to see that now."
Ameobi will leave the club at the end of the season if he is not offered a new deal.