Golovin, 22, looked set to join Chelsea after the Premier League side agreed on a £27m (R467m) fee with CSKA Moscow during the 2018 FIFA World Cup.
However, the technically gifted playmaker who was one of the standout performers at the global showpiece started a 'new adventure' in Ligue 1 with AS Monaco.
Monaco vice president and chief executive Vadim Vasilyev said there had lots of interest in Golovin from 'very large' European clubs but ultimately the lure of first-team football convinced him.
"Aleksandr has chosen the sporting project of Monaco, which will offer him the best conditions to continue his progress," he said, as quoted by BBC.
After winning three Eredivisie titles and captaining Ajax, Klaassen moved to Goodison Park in a £24m (R415m) deal surrounded by much fanfare.
However, compatriot Ronald Koeman's was sacked as manager shortly after his arrival and the Netherlands star was left in limbo.
Klaasen made only 16 appearances for Everton, with just three Premier League starts to his name.
He's now ended his Merseyside nightmare by joining Bundesliga side Werder Bremen in a cut-price £12m (R207m) deal, where he will look to replicate the form that saw him score 55 goals and register 38 assists in 180 games at his hometown club.
The club also announced the return of legendary striker Claudio Pizzaro for a fourth spell.
After signing Cristiano Ronaldo in a club-record £100m (R1.7b) deal, the club have now looked to recoup their finances in order to bolster the first-team even further.
As such, Massimo Allegri has decided to part with one of the Azzurri's rising stars.
Rolando Mandragora, 21, made his debut in Italy's midfield last month and looks set for a big future as a technically proficient defensive midfielder.
The left-footed starlet completed a £17m (R294m) switch to domestic rivals Udinese, but the Serie A giants have inserted a buy-back clause into the deal.