Born: 7 Nov 1995
Where: Southampton
Joined Wycombe: October 2015 - Loan from Southampton.
Wycombe debut: Stevenage 2 Wycombe 1 - 17 Oct 2015 - League Two
First goal: Wimbledon 1 Wycombe 1 - 21 Nov 2015 - League Two
Returned to Southampton - May 2016
Re-joined Wycombe: August 2018 - 'Undisclosed fee' from Barnsley.
Contracted until June 2021.
Career summary at Wycombe.
39 appearances - 2 goals
Up to end of 2017/18 season
Career Details - (*) indicates loan spell
Date Club League
Jul12-Jan13 Southampton 0(1) 0 0(0) 0
Oct15-May16 Wycombe Wanderers(*) 35(0) 2 4(0) 0
Jun16-May17 Walsall(*) 46(0) 5 6(0) 0
Jun17-Aug18 Barnsley 17(4) 0 3(0) 0
2018/2019 Wycombe Wanderers - - - -
Southampton born and joined his home side's Accademy in 2002, progressing through The Saints youth ranks to Captain their Under 21 side. Made his Premier League debut for Southampton on 26 December 2014, coming on as 87th minute substitute v Crystal Palace. However, he had not added to his First Team tally prior to the loan deal with Wycombe being announced on Tuesday 13th October 2015 - the then 19 year old centre-half joining on an initial one month loan deal - his spell at Wycombe being his first loan away from his birthplace club.

Commenting on the deal, Manager Gareth Ainsworth told the official website: "Jasonís a very highly-rated defender whoís had good experience in the under-21s at Southampton and they feel heís ready to go out and get a taste of what senior football is like at 'League Two' level. Our last two games havenít reached our high standards defensively and heís a new option who adds competition for us, with Anthony Stewart still missing for another couple of months."

He was allocated the No.22 in the Wanderers squad with he deal originally running until 12th November 2015 but this was extended until 3 January 2016 and then until 3rd February 2016. On the 1st February 2016 it was confirmed that the loan deal had been extended until the end of the 2015/16 season (including any play-off games).

He completed his loan season at Wycombe with 39 appearances to his name and netted his first senior goal in the 1-1 draw at Wimbledon in November 2015. Highlights of the season for the youngster included bagging the winning goal in the 2-1 vicotry over Oxford United at Adams Park in December 2015. Later in the season he also made a brief appearance in goal for Wanderers when he has forced between the stick after Matt Ingram had been red-carded late on and with no remaining substitutes in the home game with Morecambe in January 2016. Although Wanderers fell-out of promotion contention by the end of the 2015/16 season, his season was capped when he won the Supporters' Player of the Season award.

Having returned to Southampton in May 2016, he subsequently spent the following season on loan at 'League One' side Walsall- being ever present in League games and scoring five times for The Saddlers and once again scooping the Supporters' Player of the Season award. In June 2017 McCarthy left Southampton to join then 'Championship' side Barnsley on a three year deal for a reported £200,000 fee.

On 9th August 2018 it was announced that McCarthy had agreed to leave now 'League One' Barnsley and rejoin Wanderers on a three year deal for an 'undisclosed fee'. Gareth Ainsworth commented: "This is a massive coup for us and Iím thrilled to be able to bring Jason back here on a permanent deal. He was outstanding for us during his loan spell, making his Football League debut and scoring a couple of important goals as well." He added: "The fact that Jason wanted to come back here is testament to my staff and the work they put in to help him develop his game when he was just a teenager starting out in senior football. We have a proud track record of working with young players and Jason was one of our biggest success stories, which is why having him back on a permanent deal is a huge boost for everyone at the Club."

Commenting on his return to Adams Park to the official website, McCarthy said: ďIím so buzzing to be back, linking up with the gaffer again, a lot of the boys are still here from my first time, and I canít wait to see the Wycombe faithful either,Ē he smiled. It was a really enjoyable time for me here. Wycombe is a club I hold so close to my heart because it was my first real opportunity in football. I had great memories of [the 2015/16 season] and I feel the gaffer got the best out of me. We had a good team then and an even better one now, and the club are getting a better player back as well."

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