Until last year, Ethan Pinnock looked more likely to become a PE teacher than a professional footballer but it is now he who is learning lessons after making his EFL debut for Barnsley on Saturday.

The defender did a degree in physical education while working in schools as a coach to supplement his modest income from playing for part-time Dulwich Hamlet in the seventh tier of English football. He graduated last year when he also earned a move to the top level of non-league football with Forest Green Rovers whom he then helped into League Two before moving to Barnsley this summer.

The 24-year-old from London started in the Reds' EFL Cup win over Morecambe earlier this month but had to wait until Saturday for his league debut, coming on at half-time in the 1-0 derby loss to Sheffield United following a red card for fellow centre-back Angus MacDonald.

Pinnock told the Chronicle: "I have always wanted to be a professional footballer. When I was in non-league I had to do other things just in case because I couldn't always count on football. But I did work hard on my game and, luckily, I was able to reach where I wanted to.

"I was delighted to make my debut in the league, even though it obviously wasn't the ideal circumstances. The pace of the game was quick which is something I have got to get used to. I thought I did pretty well when I came on.

"The big difference is the intensity and speed of thought so you always have to be sharp and aware and you can't really switch off. I think quality-wise there are a lot of players who are really technically gifted so you have to be aware at all times when you are on the pitch.

"I am enjoying it at Barnsley. All the lads are really good. We're a tightknit bunch. Everyone has a bit of banter with each other. We like to work hard and push each other on."

Pinnock will now attempt to keep his place in the team during captain MacDonald's three-game ban. He said: "As captain, Goose is a big player to lose but there are more leaders in the changing room. Red cards happen in football and we have to move on and concentrate on the next couple of games without him. But, once he comes back, it will be a boost for the team."

Barnsley changed to a three at the back after the red card, something Pinnock had not worked on in training at Oakwell. But it is a formation he is used to from Forest Green and one that allowed the naturally left-sided player to attack down the wing on occasion.

"Last season I played in that formation a few times. It's not something we have practised at Barnsley but in games you have to adapt sometimes. Driving with the ball is one of my strengths but I feel I could have done it more."