Merson believes the Brazilian’s form of late has helped the Gunners turn a corner.
Following the removal of Pierre-Emerick Aubameyang from the team, Martinelli has been given an opportunity to impress Mikel Arteta.
The Brazilian netted twice in Gunners’ the 4-1 win over Leeds at the weekend and the 20-year-old will once again be hoping to lead the line in their EFL Cup quarter-final clash with Sunderland tonight.
“Martinelli is a very special talent. I like him, but the question is: how long is he going to be fit for? If he can maintain his fitness, Arsenal have got a new signing – a £50m player,” he told Sky Sports.
“On top of that there’s Bukayo Saka and Emile Smith Rowe, Martin Odegaard is starting to look like the decent player he was meant to be when he arrived at Arsenal, Thomas Partey is starting to play now.”