The striker, still only 22, started his career with Ipswich Town, becoming an impressive Championship forward whilst a teenager, and earning a move to Sunderland in 2011.
Things have never truly gone his way on Wearside, as the former England youth international scored just 15 goals in 91 games across his entire stay in the North East.
His most prolific spell in front of goal came towards the end of the 2013/14 campaign, when five goals in three games against Manchester City, Chelsea and Cardiff City played a vital role in keeping the Black Cats in the top flight.
Last term, he was often pushed out onto the wing to cover for deficiencies in the Sunderland squad, and reviewing his career with the club, it look as if was the wrong place at the wrong time for Wickham.
He has now moved to Palace, where he will be likely to feature in a central role as a replacement for Glenn Murray - who is likely to leave Selhurst Park this summer.
Wickham and Patrick Bamford will be vying to score the goals in Palace’s impressive attacking ranks, and although the mooted £9 million fee is large for a striker with few goals to his name, Wickham is still young enough to prove worth it.
Fans took to Twitter to react to the confirmation of the signing, and although some Palace fans were pleased with the deal, supporters of both clubs were surprised at the size of the fee Wickham cost the London club.
I really hope Wickham proves me wrong, I'm not convinced, stats don't lie— Danny Dell (@DannyDell97) August 3, 2015
Connor Wickham completes his £9 million move to Palace, shocked nobody tried to hijack with a higher bid...said nobody...worst signing ever?— Mark Robbo Robinson (@RobboGTFC) August 3, 2015
People complaining about Wickham, 2 years ago we signed Elliot Grandin and Jimmy Kebe and still had a team that finished 11th #cpfc— Paul Goswell (@Paul_Goswell) August 3, 2015
Connor Wickham for 9million quid? Seriously, this is an absolute joke.— Nick Barron (@nickbarronjnr) August 3, 2015
Cannot believe palace have wasted 9 mill on Connor wickham— Joe Smith (@OD_SMITH) August 3, 2015
Don't understand what Connor Wickham has done to be worth 9 million he's awful— Josh (@BrewisJosh) August 3, 2015
So Wickham has gone.Relieved TBH.For most of the time at Sunderland he hasn't shown potential consistently for long periods.5 or 6 games max— Simon (@KingstonSi) August 3, 2015
Connor Wickham had a 1 in 7 goal ratio for Sunderland, as much that it's sad we've lost a young talent, He just didn't score enough. #SAFC— Liam Kennedy (@KennaSAFC) August 3, 2015
I love the abuse we're getting for signing Wickham. Very good signing in my eyes. Though Murray or Gayle will now be off.— Ryan (@palacenutter) August 3, 2015