FOREST GREEN boss Mark Cooper insists he will only relax when his side are mathematically safe.

Rovers virtually rubber-stamped their League Two status as stoppage-time goals from substitute Dayle Grubb and Christian Doidge guided Rovers to a 4-1 victory, sending Chesterfield to a probable second successive relegation.

Rovers started slowly as basement-boys Chesterfield missed a raft of chances. However, Rovers took the lead on 26 minutes when left-back Scott Laird arrowed in an angle drive from 25 yards.

Kristian Dennis levelled things up from the penalty spot for Chesterfield on 36 minutes after Reuben Reid clipped Drew Talbot inside the box.

Cooper’s side now require a point from their final three games and will hope to achieve their goal at Yeovil Town on Tuesday night.

“We are nearly over the line, but I refuse to relax until everything is done and dusted,” admitted Cooper.

With 15 minutes to go Cooper introduced Grubb and his impact was immediate, just two minutes after coming on, he rolled in Doidge who finished with aplomb for his 23rd goal of the season.

Chesterfield’s Jacob Brown struck the post on 90 minutes and as the game entered six-added minutes before an impish piece of skill from Grubb made it 3-1 on 94 minutes. A minute later Alex Bray was tripped in the box for Doidge to convert his second and Rovers’ fourth, his 50th in two seasons.

“I wanted Doidgey to make sure he took the penalty properly and scored because it gives us an extra goal on Barnet,” he said.

“Barnet have got two crunch games in Morecambe and Chesterfield which is good for us.”

“It was a tough afternoon and I thought Chesterfield acquitted themselves really well and asked a lot of questions of us.

“It was a very tense occasion as you would expect but we managed to get the job done.

“I didn’t enjoy it one bit, it was a tough and tense afternoon.

“Tactically it was tough, trying to know when to make the changes and when to switch the system which we did and luckily enough we switched and got the goal straight away.

“We didn’t want to open ourselves up too early and go 4-4-2 because Chesterfield have got technically good players and it fell just right for us.

“They changed to 4-4-2 just as we were and it enabled us to match up and our subs probably had more of an input than theirs.”

Rovers were indebted to Chelsea loanee keeper Brad Collins, who denied Kristian Dennis with 20 minutes to go and Cooper acknowledged his growing influence.

“ Brad Collins was outstanding and we have managed to get four goals off the back of it," admitted Cooper.

"His development has been incredible and he will go back to Chelsea an accomplished young goalkeeper.”

Cooper was, as always, confident that his side’s possession-based game would come out on top.

“It’s important we stick to the way we play because when we go back to our goalkeeper we always end up in a better position,” he added.

“That happened on numerous occasions today and I know the crowd get frustrated but I’m not going to change that and that’s how we play.

“It was important today that we stuck to that because the heat was incredible and difficult for the players to get around the pitch.

“It’s not possession for the sake of it, it’s trying to be safe and make sure the opposition can’t hurt you by giving them the ball.

“That’s what we believe in and I think we’ll be alright with it once we get accustomed to the league.”