Speaking in an interview with Ladbrokes, Petit said: "Saka being out for a few weeks is a huge blow – but other players now need to come in, step up, and take on the responsibility. I've been waiting for some players to reach a level, and I'm quite frustrated, to be honest, actually. I'm still waiting for them to reach the next level. I'm thinking about Gabriel Martinelli, for example. I'm not happy with Martinelli. He had a good game against Crystal Palace a few days ago, but that's not enough.
"When you look at his journey, and how he started in the first-team, around the same time as Saka… when you look at how Saka has improved, year after year, and has become one of the best players in the Premier League, I'm thinking "when is that going to come from Martinelli?
"He's not the only one; Gabriel Jesus is the same. He's been playing well, recently, but that's not enough. I'm sorry, but that's not enough."