Country: Iceland
Arteta needs to get someone else to do Laca's defensive duties so he can spend more time in the box and do his thing. Whether that's Willian or Dani or someone new we bring in, I don't know.
In modern football, we defend as a team. No need for Laca to stay in the box when defending. If Laca can improve his stamina he should be able to do both jobs for 90 minutes.