Hamsik is struggling to find a way into Benitez's first team.
Benitez said: "Hamsik is a player who no longer has Ezequiel Lavezzi and Edinson Cavani by his side, so he needs to take on a greater share of the responsibility. He started the campaign well, but lost something with the injury.
"He works very hard, but has to show everyone 'I am here' and ensure he is always seen."
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