Shall scrum master repremand a team member

Hi,
I am a scrum master on a new team in a new organisation, There is a team member who in my opinion does not pull 100%.
I have noticed some things like : sometimes late for standup, not updating the tasks on board, little things like that, also a little bit negative retro meeting. I am new to a team so not sure what is the best way to approach this situation?