Diagne, 27, has netted a staggering 20 goals in 17 Super Lig appearances for Kasimpasa since his free transfer arrival upon leaving Chinese outfit TJ Teda in the off-season.
The towering striker's goal was leading the unfancied Turkish side to an unlikely title charge, but after a dip in form over the new year, domestic rivals Galatasaray have snapped the three-time capped Senegal star up in a €10 million (R152m) deal.
Gala currently trail league leaders Istanbul Basaksehir by six points after 19 games played but are also competing in this season's UEFA Europa League.
- Forgotten Kagawa
Shinji Kagawa, once rated as Europe's leading playmakers upon joining Manchester United in a €16m (R244m) deal back in 2012 hasn't quite lived up to expectations and even a return to Dortmund has failed to spark that glittering form he enjoyed under Jurgen Klopp during their Bundesliga successes.
After just one league start under manager Lucien Favre this season the 29-year-old has now completed a loan switch to Besiktas for the remainder of the campaign.
The 95-time capped Japan star will be hoping to inspire the cash-strapped Turkish side who've lost several of their first-team stars over the last month.
- Wilfried Bony
Another player who's endured a dramatic plight since a dream switch in the Premier League, the burly Ivory Coast international has not seen his career go to plan since joining Manchester City for €33m in January 2015.
After a loan spell at Stoke and then a return to Swansea, where he suffered relegation, the injury-plagued striker has now been shipped off to Qatar outfit Al Arabi on loan - seemingly to get his exorbitant wages off the club's books.
- Yannick Bolasie
The DRC winger displayed so much promise with Crystal Palace for three seasons in the English top-flight which saw Everton fork out £25m for his services.
However, injury has seriously hampered his progression, limiting him to a peripheral role at the Toffees.
After cancelling his loan deal with Championship club Aston Villa, the tricky winger has now been shipped off to Belgian giants Anderlecht on a six-month deal in a bid to recapture the form that made his one of the most sought after wingers in England.
Liverpool have agreed Lazar Markovic join Fulham on a free transfer, ending his five-year nightmare spell with the Reds since Brendon Rodgers forked up £20m (R348m) to acquire him from Benfica,
The pacey winger replaces Aboubakar Kamara, who has been sent on loan to Yeni Malatyaspor, after being banned from the club upon being arrested for assault during a recent training ground row.
Jean-Clair Todibo was recently announced to join FC Barcelona at the end of the season, but upon the confirmation, the France wonderkid was banished to the reserves of Ligue 1 side Toulouse.
Barca have since accelerated the deal and brought him in immediately on nominal fee, strengthing their defensive and midfield options for the rest of the current season.
The young Nigeria goalkeeper who represented his nation at the 2018 FIFA World Cup, Francis Uzoho has left Spanish side Deportivo La Coruna for Cypriot giants Anorthosis for the rest of the season.
And last but not least, Michy Batshuayi, a £33.2m (R578m) signing from Marseille in 2016, was linked with a host of clubs including Tottenham, West Ham, Everton and AS Monaco.
However, at the last minute, he's been announced as a Crystal Palace player for the remainder of the 2018/19 season - ending his nightmare Valencia spell in LaLiga.