Celtic star Christopher Jullien has issued a rallying cry after his side's shock defeat to Livingston before the international break.
The Parkhead side lost top spot in the Premiership table to Rangers after Gary Holt 's side ran out 2-0 winners.
The Frenchman struggled to deal with the Lions' physical approach and striker Lyndon Dykes, in particular, who got on the scoresheet.
The 26-year-old was guilty of getting involved in various altercations with the opposition and visibly lost his cool on occasion.
But Jullien has thanked the Livi forwards for giving him a 'wake-up call' after a difficult afternoon at the office.
He said on Twitter: "Have to make some things right. Sorry Celtic fans for being too nervous last time, it won't happen again.
"And to be fair I have to thank Livingston's forwards for that wake up call. Either I win or I learn."
Celtic will look to get back to winning ways this weekend as they host Ross County on Saturday.
