Brendan Rodgers has insisted Celtic must improve their frontline as he outlined his immediate transfer priority.
The Celtic boss cited the departure of Kyogo Furuhashi and Nicolas Kuhn as he admitted there is work to be done in the summer window.
Rodgers provided the transfer update after Celtic fell to a 3-2 defeat to Estrela da Amadora at Benfica's training centre on Saturday.
Reo Hatate and Adam Idah were on target for Celtic, but the Portuguese side claimed a narrow victory in the bounce game.
Addressing the press after the match, Rodgers conceded, "we need to improve the squad".
And Rodgers insisted staff are hard at work to address the attacking issues as he confirmed work is ongoing on transfer signings this summer.
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As quoted by The Scottish Sun, Rodgers said: “There's work going on behind the scenes.
“It's clear we need to improve the squad.
“There’s a lot of work going on behind the scenes, there's loads of names floating about.
“We're clear that we need to improve our frontline.
“We lost Kyogo in January and another player with Nicolas gone.
“That's a lot of goals that's gone out of the team.
“So for us, we need to strengthen that area of the field. But the guys back home are working hard on that.”