Artur Boruc has played for Legia Warsaw, Celtic, Fiorentina, Southampton and Bournemouth
Bournemouth manager Eddie Howe says it was "not ideal" that goalkeeper Artur Boruc attended Legia Warsaw's Europa League defeat by Rangers in Glasgow on Thursday night.
Former Celtic keeper Boruc, 39, was in the away end at Ibrox to support Legia, for whom he played from 1999 to 2005.
The ex-Poland international has been an unused substitute for Bournemouth's three Premier League games this season.
"It's something I'll have to talk to Artur about today," said Howe.
"I only knew about it very late last night, so it's not really ideal."
Bournemouth travel to Leicester in the league at 15:00 BST on Saturday.
Aaron Ramsdale has been preferred to Boruc in Bournemouth's three league matches, while Mark Travers played in the Carabao Cup second-round win over League Two side Forest Green on Wednesday.
Rangers beat Legia 1-0 to secure a 1-0 aggregate win and qualify for the Europa League group stages.
Source: bbc.com