‘Martinelli was sensational when he came in last season.
‘He is a real handful – strong, direct and reminds me of the Brazilian Ronaldo. The way that he picks up the ball and runs at goal is phenomenal.
‘I am not saying that he is Ronaldo but he reminds me of him, especially with that goal he scored at Chelsea.’
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‘Big future but I do not want to put too much pressure on him because he suffered that injury and he needs time to come back and get his feet under the table again, get comfortable and play games.
‘Players tend to get long-term injuries and then come back and pick a niggle up somewhere else. He will need time to get back into the swing of things.’
Ronaldo’s former Brazil team-mate, Ronaldinho, also made a similar comparison to Campbell back in January.
‘We as Brazilians are very excited about him and his future,’ Ronaldinho told The Mirror.
‘It is one thing to have the talent, but another at the age of 18 to have the confidence.
‘He reminds me of Ronaldo. In his first season in Europe, he scored 30 goals and people were thinking, ‘Who is this 18-year-old Brazilian kid?’
‘He wanted the ball, he would run at players, there was no fear no matter what players or team he was playing against – and I see that similar attitude in Martinelli. He just wants to be on the ball and score goals.’