Hearts manager Craig Levein admits that he smelled blood when he saw five changes had been made to Celtic's side amid two pivotal Champions League qualifying games.
"Entering the last 10 months of his contract, everyone understands that he can not put his career at risk by playing even slightly injured or at 95 per cent", said Lichtenstein.
He said: "Offers of £7million and £8million - but apparently Celtic is financially strong enough not to go into that". He does not want to take the risk of making that injury worse, because in four months he can talk to any club about a free transfer'.
"The only other point; Dedryck's agent turned up (on Friday) at the training ground, which is closed the day before the game".
Boyata has developed into one of the key players for Celtic since he joined from Manchester City in 2015.
'I told him I wanted to speak to him afterwards, but when I returned after the training, he was no longer there'. All I want is for us to improve every aspect of the club.
Bullish over Celtic's chances in the Olympic Stadium despite the loss of an away goal in Glasgow, Hendry added: 'If we play as we did at home we shouldn't have any problems.
AEK Athens boss Marinos Ouzounidis played down Ajer's absence, saying: "They also have Jack Hendry and Jozo Simunovic and they both played in some of Celtic's major wins past year, so they are great players with great qualities".
A Simunovic error paved the way for Kyle Lafferty's victor as the Scottish champions rested key players at Tynecastle.
"Given the quality of the squad we have, we are more than capable of scoring goals".
"We are not going into the match thinking that we have to take a goalless draw". This season is the last of his contract.