PSG finished second behind Montpellier last season despite signing Javier Pastore, Thiago Motto and Kevin Gameiro, but former Juventus midfielder Sissoko believes his side are set to recover this term.
"We will not hide. Our goal is to be champions. It will erase the mistakes we may have made last season," he said.
"The club has invested a lot on very important players and we know what lies ahead. We will not put extra pressure on ourselves - we will just do the work to achieve the objectives that are the championship and a good run in the Champions League."