Could one Celtic player's return have a negative impact on the development of another?
The 28-year-old has been blighted by injury this season, featuring just 16 times in all competitions, but his latest comments suggest he has every hope of featuring regularly for the Bhoys next season, provided of course manager Ronny Deila picks him.
“I won’t make the Sweden European Championship qualifiers next month,” Lustig said, “but I am aiming to be back when we start up for the new season.”
While that will be good news for those Celtic fans hoping the Swede is ready to put his injury woes behind him, it could have an impact on another right-back seeking his breakthrough at the club.
Darnell Fisher has made 21 senior appearances for Celtic in total but only eight of those have come this season.
He was used against both Dundee and Aberdeen in recent league games but was an unused substitute against St Johnstone, and with Lustig potentially coming back into the reckoning, Fisher may have to get used to more time on the bench.
At just 21, the young Englishman has plenty of time to make it at Celtic, but he will know that his inexperience could cost him chances that may otherwise have come his way if Lustig had not been in the picture.
Celtic will need all the players they can get for the campaign to come, but while one player looks to put two years of injury problems behind him, another will be pushing hard for more chances of his own.