Birmingham are "deeply shocked and saddened" by the death of one of their former players and his wife in Tunisia.
Former City player Denis Thwaites and his wife Elaine are reported to have been killed in the terrorist attack on Friday.
The family of the couple, from Blackpool, Lancashire, appealed for information about their whereabouts after the tragedy.
On Monday night, Birmingham tweeted about the deaths of the Thwaites.
The club said: "We are deeply shocked and saddened by the death of former player Denis Thwaites and his wife Elaine in the Tunisian terrorist attack.
"Our thoughts are with Denis' family. The club also offers its condolences to all who are mourning loved ones due to this atrocity."
Gordon Marsden, MP for Blackpool South, wrote on Twitter: "Very sad to hear Denis and Elaine Thwaites from Blackpool among those killed in the terrorist attack in Sousse and condolences to their family."
The retired couple, aged 70 and 69, arrived in Sousse on Wednesday and had been staying at the Hotel Riu Imperial Marhaba.
Mr Thwaites, originally from Stockton, was a player with Birmingham in the 1960s and 70s, being part of the squad that won the League Cup in 1963.
"Denis was a talented professional at Blues between 1962 - 1972," said City on their official website.
"A pacy outside left, Denis made his debut at the age of just 16 in a League Cup tie at Swindon Town."