By North-west correspondent Alex Stevens

Roberto Martinez has predicted a “massive” summer for Everton in the forthcoming transfer window.

The under-fire Goodison Park manager has told supporters to be braced for significant investment in the squad following the takeover earlier this year.

Billionaire Farhad Moshiri bought a majority stake in the Merseyside club and this will be the first opportunity to invest in players under the new board.

Martinez has come under fire from supporters and pundits for a season which has failed to live up to expectations following the impressive progress made in his first two campaigns.

Everton are 11th in the Premier League and were eliminated from the FA Cup at the semi-final stage last week, prompting reports that the Spaniard will be sacked in the summer.

But, in an interview with the Daily Mail, Martinez spoke with the confidence of a manager who expects to be around to oversee the refurbishment of the squad in the summer.

“I have been here three seasons and there is an incredible amount of understanding and know-how of what we need to do,” Martinez told the Mail. “Is this a massive transfer window coming up? It is. Massive. Probably as big as the summer window in 2013. We have to be stronger at the end of it.

“There have been changes internally, with the new shareholder Farhad Moshiri. That is going to bring a huge amount of possibilities. We are hurting.

“We gave our all in the FA Cup semi-final and didn’t get what we deserved but the support was incredible. It has given us the perfect stimulant to go on and achieve next season.”

In the summer of 2013, long-serving players like Marouane Fellaini, Phil Neville, John Heitinga and Victor Anichbe left the club and the likes of Romelu Lukaku, James McCarthy, Joel Robles, Arouna Kone and Aiden McGeady were signed.

“When I arrived here three years ago the squad needed fresh blood and regeneration,” Martinez added to the Mail. “We haven’t had the finances that other clubs have. All we have done is try to generate our own money and be clever with how we sold assets. You have to learn through painful experiences.

“We have had to bring in new blood and new energy.

“We had to get over a successful generation and we couldn’t bring players that were ready-made. We had to make them. All of a sudden, we have put together this exciting squad without spending money.

“That is important. People think we just manage funds. That is where the disappointment is. We haven’t achieved what we wanted to.”

In other Everton news, it has been reported that there are five main contenders to replace Martinez in the summer.