The Welsh custodian became the club's first-choice goalkeeper during the 2015/16 campaign and capped-off a fine personal season by playing in a first ever FA Cup final and helping Wales reach the semi-finals of Euro 2016.
Hennessey was the Eagles’ first signing of the 2014 January transfer window after joining from League One side Wolverhampton Wanderers, having come through the ranks as a youngster at Manchester City before joining the Wolves Academy set-up in 2003, signing his first professional contract two years later.
After a successful loan spell at Stockport County – where he started his professional career with a Football League record nine consecutive clean sheets – Hennessey returned to Wolves as No.1 for the 2007/08 season.
He helped them gain promotion to the Premier League in 2009 and played 13 top-flight games the following season, but following successive relegations into League One, he found himself loaned out to Championship side Yeovil Town at the start of the 2013/14 campaign.
However he would be snapped up by Tony Pulis and made his Eagles debut on the final day of that season in Palace's 2-2 draw with Fulham. He made seven more appearances for the side in 2014/15 before going on to establish himself as first-choice the following campaign, something he managed to achieve once again in 2016/17 as he ousted Steve Mandanda as the club's number one shot-stopper.
Hennessey has been a regular in between the sticks for the Wales national side since making his debut in 2007 and completed a half century of caps for his country during the Red Dragons' successful Euro 2016 qualification campaign. He featured in all-but-one of their matches in the finals, where they made it to the final four before being knocked out by Portugal.
Today he is the Eagles' most capped international ever, overtaking former captain Mile Jedinak in October 2018 with 51* international appearances while signed for Palace.
*Correct as of September 11th, 2020.