There's certainly a knack to transfers and Celtic have got it down to a fine art.
A lot of talk in recent years has centred around Scottish teams following the Ajax and Porto models when dealing in the transfer market.
The buy low, sell high, signing strategy works and Celtic are certainly reaping the benefits of their approach in the market.
Ajax's thrilling run to the semi-finals of the Champions League was built upon homegrown talent and shrewd signings.
It would take an exceptional effort from the Premiership champions to replicate such an achievement but the Hoops faithful are fully aware healthy balance sheets can boost the on-field product.
Virgil van Dijk and Victor Wanyama certainly benefited from their time at Parkhead and such deals can help convince others to follow in their footsteps.
And Celtic are once again in the money after Kieran Tierney 's £25m switch to Arsenal was confirmed on Thursday.
The left-back's exit follows on from Moussa Dembele's £19.7m move to Lyon before the close of summer window in 2018.
Record Sport Online looks at the numbers behind Celtic's five-year success story when it comes to finding the right price for their players.
2019
Kieran Tierney to Arsenal – £25m
Brendan Rodgers & coaching staff to Leicester (compensation) – £7m
2018
Moussa Dembele to Lyon – £19.7m
Virgil van Dijk to Liverpool (sell-on fee) – £7.6m
Stuart Armstrong to Southampton – £7.16m
Erik Sviatchenko to Midtylland – £1.03m
Liam Henderson to Bari – £108k
2017
Emilio Izaguirre to Al-Feiha – £1.26m
2016
Stefan Johansen to Fulham – £2.07m
Stefan Scepovic to Getafe – £1.2m
Victor Wanyama from Southampton to Spurs (sell-on) – £1.3m
2015
Virgil van Dijk to Southampton – £14.13m
Adam Matthews to Sunderland – £2.52m
Teemu Pukki to Brondby – £610k
2014
Fraser Forster to Southampton – £11.25m
Total
£102million
