Southampton are furious that ref Mark Clattenburg has been cleared after their complaint against him for his behaviour towards captain Adam Lallana.
Saints are considering an appeal to the Football Association over the ruling by the Professional Game Match Officials Limited (PGMOL) that Clattenburg has no case to answer for his conduct in the 2-1 Barclays Premier League defeat to Everton on December 29.
PA Sport reports in a letter Southampton claimed Clattenburg told Lallana: "You are very different now, since you've played for England - you never used to be like this."
Now Southampton have pledged not to let the matter lie.
A club spokesman said: "An official insulting any player, no matter his intentions, is clearly not acceptable behaviour. For this reason we do not accept the verdict of the PGMOL in relation to this case and do not consider the matter to be over.
"Under the circumstances we do not feel it appropriate for Mr Clattenburg to officiate in any of our matches until this matter is properly resolved."
