Celtic manager Neil Lennon has stated his intent to step up the search for new signings this summer.
The Hoops successfully qualified for the Champions League play-off round by beating Elfsborg 1-0 over two legs, but Lennon is keen to fill the gaps left by the departed key-players.
The 42-year-old Northern Irishman knows from experience that the Champions League can be unforgiving at the best of times, and wants to bolster his ranks before the group stages, should his team get there.
"We are going to work hard to get a few players in, the players are running on empty," he said.
"These qualifiers are tough and we have two games to go before the group stages."
Celtic were weakened this transfer window by the departures of Victor Wanyama and Gary Hooper, the latter having finished Celtic's goal-scorer three seasons running.
The Scottish champions may also lose defender Kevin Wilson to Nottingham Forest, which would leave them with a squad dangerously bare of experience. Lennon has already made it clear that he would love to replicate last season's European venture, where they beat Barcelona and reached the knock-out stages.
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