Michy Batshuayi has extended his Chelsea contract until 2023 and joined Besiktas on loan for the 2021-22 campaign.
Batshuayi, who joined the Blues in 2016, has spent much of his time at Chelsea out on loan.
He thrived with Borussia Dortmund in 2018, though struggled at Valencia the following season, switching to Crystal Palace on a temporary basis for the back half of 2018-19.
The Belgium forward was a target for Palace in the following transfer window, but remained at Chelsea. He made 24 appearances, though few of them were starts, scoring seven goals.
Batshuayi did return to Selhurst Park last season, though scored just two goals from 18 Premier League appearances for the Eagles.
The 27-year-old had entered the final year of his Chelsea deal, but that has now been renewed, with an immediate season-long loan to Turkish champions Besiktas confirmed on Wednesday.
"Very very happy to join Besiktas," Batshuayi, who received a huge welcome when he landed in Istanbul, tweeted.
"An incredible opportunity for me and I'm already looking to play. Thank you to all the fans for the crazy welcome at Istanbul. See you at the stadium very soon."
Batshuayi slipped further down the pecking order at Chelsea upon the arrival of his compatriot Romelu Lukaku, who re-joined the European Champions in a reported £97.5million (€115m) deal from Serie A champions Inter last week.
He is the third centre-forward to leave the club this transfer window, with Chelsea having sold Olivier Giroud to Milan, while Tammy Abraham was unveiled as a Roma player on Tuesday.
Thomas Tuchel still has plenty of high-quality attacking options at his disposal, with Lukaku spearheading a forward line that also includes Timo Werner, Kai Havertz and Christian Pulisic, with support provided from midfielders Mason Mount, Hakim Ziyech and Callum Hudson-Odoi.
Chelsea midfielder Fernandez undergoes groin surgery
Chelsea will be without Enzo Fernandez for their final six games of the season due to a groin issue.
Fernandez was forced off with an injury during Chelsea's 5-0 defeat at Arsenal on Tuesday.
And it has now been confirmed the 23-year-old World Cup winner has undergone surgery, and will subsequently miss the final month of Chelsea's campaign.
Fernandez has made 28 Premier League appearances this season, scoring three goals. Chelsea did not put a timeframe on his return, though Argentina will be hoping the former Benfica star is fit to feature in the Copa America, which begins in late June.
The Blues sit ninth in the table, though they do have games in hand on all of their rivals for European qualification.
Mauricio Pochettino's team take on Champions League hopefuls Aston Villa on Saturday, with fixtures against Tottenham, West Ham Nottingham Forest, Brighton and Bournemouth to follow.
Gallagher insists Chelsea players are fighting for the shirt after Arsenal collapse
Conor Gallagher insists Chelsea's players are putting in the required effort amid fierce fan criticism in the aftermath of Tuesday's 5-0 defeat to Arsenal.
Chelsea's miserable first season under Mauricio Pochettino took another turn for the worse at the Emirates Stadium as they were put to the sword by Mikel Arteta's title contenders.
The Gunners racked up 27 shots at goal as they recorded their biggest ever victory over Chelsea, who looked devoid of inspiration with leading goalscorer Cole Palmer sidelined due to illness.
During the game, one disgruntled travelling fan held up a banner which read: "I don't want your shirt, I just want you to fight for ours".
The charge that Chelsea are not fighting for results was put to Gallagher by TNT Sports after the game, and the Blues' stand-in captain denied that was the case.
"We definitely are putting the effort in," Gallagher said. "I know how much it means to all the boys. It's a very young squad with not much experience as a team in the Premier League.
"This season we've had a lot of ups and downs. We're still improving and working as a team to get to that next level.
"Today was one of those days where we were nowhere near it and we need to dust ourselves off, look at the performance, where we can improve and all the mistakes we made."
The defeat means Chelsea remain ninth in the Premier League table, three points adrift of sixth-placed Newcastle United and Manchester United in seventh, with both of those teams in action on Wednesday.
Pochettino's men face another daunting task on Saturday when they travel to Champions League-chasing Aston Villa, before hosting Tottenham in another London derby next Thursday.
'When we are bad, we are so bad' – Pochettino slams inconsistent Chelsea after Arsenal rout
Mauricio Pochettino slammed Chelsea's lack of consistency after they were thrashed 5-0 by Arsenal on Tuesday, saying: "When we have bad days, we are so bad."
Chelsea travelled to the Emirates Stadium looking to close the gap to the Premier League's top seven, but instead saw their European hopes further dented by a chastening 5-0 defeat.
The defeat was Chelsea's heaviest ever against the Gunners in all competitions, and their worst in a London derby since they lost 6-0 to Queens Park Rangers in March 1986.
The fact that dismal performance came just three days after Chelsea pushed Manchester City close in the teams' FA Cup semi-final only served to rile Pochettino.
"We are showing this inconsistency and that is why we are where we are," Pochettino said.
"We are able to have an amazing performance and then one like this. When we have bad days, we are so bad. It's difficult to talk. We were talking in the same way after last season.
"We put in a fantastic performance at Wembley and then today, you can lose a game at Arsenal but in the way we competed… why one day, three days ago and then today in this way?"
Chelsea have now conceded 57 goals in the Premier League this season, their outright most in a single campaign in the competition, having previously shipped 55 in both 1994-95 and 1996-97.
In attack, they managed just one shot on target in the absence of Cole Palmer, with the Premier League's joint-leading goalscorer missing out due to illness.
Asked about the impact of losing Palmer, Pochettino added: "It wasn't the reason we lost the game, but you lose such a creative player that helps to play in the lines.
"It's difficult to lose players in these circumstances – that made the management very difficult. But today was more than that.
"We didn't compete from the beginning and it was difficult to be in the game against a team fighting for the Premier League. It's no coincidence.
"We need to compete in a different way but we are talking too much. We want to be in a different position next season. We need to take decisions."
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