The player gets a move to the German top-flight, Bayer Leverkusen get a promising talent to develop and the Parkhead turn around a significant profit on a defender they recruited from Manchester City.
It does, however, leave Celtic light in the position. Kristoffer Ajer has been playing well in the role and provided a bit more defensive stability with Frimpong’s levels having dropped. Behind the Norwegian there is not a lot of depth with Anthony Ralston on the bench against Hamilton Accies on Wednesday night.
Another aspect of the departure of Frimpong is that it makes it difficult for Neil Lennon to play with wing-backs, even more so with James Forrest still out injured.
The Celtic boss revealed that even with the £11million it could be difficult due to the impact of the pandemic on finances but he did admit that he was looking to bring one or two in.
One consideration for new signings is whether Lennon will still be Celtic boss in the summer when many expect an overhaul. There is every chance signings this month could be loan deals or free agents.
We will look at some possible options for Celtic, all with British football experience, many of which would likely be cost-effective and more than capable short-term fixes.
Scroll down and click through to see the seven players chosen from the UK and around Europe.
1. DeAndre Yedlin
The US international’s future at Newcastle United is up in the air. His contract is up at the end of the season, while he has played just six times in the league. Has been linked with Galatasaray. But is a good age and has plenty of pace and power to replace that of Jeremie Frimpoing’s. Photo: LINDSEY PARNABY
2. Yan Valery
Southampton has been a popular destination for Celtic players over the last few years. But what about the other way? There has been a loan spell for Fraser Forster. Should there be one for Valery? He has had a taste of first-team and Premier League football in recent weeks. The 21-year-old Frenchman would easily acclimatise to Celtic with the presence of countrymen. Photo: Shaun Botterill
3. Ryan Nyambe
Described as a “secret weapon” in attack for Blackburn Rovers, the 23-year-old has established himself as one of the most reliable right-backs in the league with a strong defensive profile. Is out of contract at the end of the season but the Ewood Park side may take up an option for another year. Ex-Celtic boss Tony Mowbray said he is “someone with a lot of growth still left in him”. Photo: Lewis Storey
4. Stephen O'Donnell
The Motherwell and Scotland full-back could be a smart option between now and the end of the season. His contract with the Steelmen expires at the end of the month. For the player he could put forward a case to be given a longer deal, while an international player fills a key gap for Celtic. Photo: Ross Parker - SNS Group