Dele Alli will miss the start of Tottenham's Premier League campaign.
The 23-year-old has suffered a hamstring injury, leaving Mauricio Pochettino frustrated with his persistent niggles.
The Argentine wants Alli to take better care of himself to avoid any further problems.
"I don't know if the club have communicated how long [Alli will be out] but I don't believe he's going to be ready for the start of the season," Pochettino told a press conference
"It's the same area [as previous injuries]. Yes, of course we are worried. He's still so young. Just 23-years-old and many, many hamstring problems in the last few years.
"He must pay attention to what's going on in his body, but we are here to try to help him. I think it's a minor injury, only a few weeks until he can be available again and be with the group."
