Monster Energy Yamaha team-mates Romain Febvre and Jeremy Van Horebeek both struggled to make an impact at Ottobiano at the MXGP of Lombardia.
Febvre, the 2015 champion, made a number of costly mistakes that restricted him to fifth overall with five-six moto finishes.
“I am not so happy with the way this weekend went,” said the Frenchman, “especially because I won the qualifying race so I know I had the speed to be on the podium this weekend.
“It is frustrating for me but I need to look forward and now we have a two-week break which will be good to let my ankle heal some more. Hopefully it will be better for Indonesia.”
Van Horebeek, vice-champion in 2014, is currently ninth in the points table.
“I suppose things were going a little bit better this weekend but I still feel like I am struggling a lot with myself, although eighth place in the second moto gives me a good feeling because I had to come from really far behind.
“I just have to thank my team for sticking behind me in this difficult period. They are trying really hard to get me back on track and improve every time I go back out so I am really thankful for that. I just hope I can get out of this slump as soon as possible.”