Ronald Koeman has said he will not accept second-choice transfer options in the January window as Everton look to follow the signing of Ademola Lookman with a deal for Morgan Schneiderlin.

Everton made their first signing of the winter window on Thursday when the 19-year-old arrived from Charlton Athletic for an initial £7.5m fee, potentially rising to £11m. Whereas the England Under-20 winger has been signed for his potential, Koeman has clear targets in mind to strengthen the first team this month, with Schneiderlin identified as a priority for central midfield. There remains interest in the midfielder’s Manchester United club-mate Memphis Depay.

United rejected Everton’s opening offer of £19m for Schneiderlin but negotiations will continue, with Koeman insisting he is not interested in backup options.

“We know what we want,” the Everton manager said. “We know the players we want and it is up to the board to make the deal and then, OK, if we don’t get that positive call from the board then I am focused on my job, which is to prepare the team for the next game. We will see if finally we get the players in because that is really important for the team. If not we don’t sign other players because that is not what I want.”

Schneiderlin has made only three Premier League appearances under José Mourinho this season but United are looking to recoup most of the £24m they paid Southampton for the player in 2015. Koeman said: “Sometimes business is really difficult. It is always a game between the club who needs to sell or likes to sell a player and what Everton or other teams like to pay for the player. These are negotiations. Sometimes it is going fast and sometimes it takes more time than we like.

“The final decision is always by the board. I am not the man involved in the money or the number to sign a new player. I give my technical view of the player. If the final decision by the board is that the player is too expensive and we don’t pay that price for the player I need to accept it.”

Lookman has signed a four-and-a-half-year contract and, although not in Koeman’s immediate first-team plans, he will be able to press his claims by training with the senior squad. The manager said Everton had to move swiftly for the coveted winger, with the club’s academy short of options in that position.

“First of all you need to look always at your under-23 team,” he said. “If you have that winger then you don’t sign a new young boy for that money in that position. We have Dominic [Calvert-Lewin] as a striker and Tom Davies as a midfielder and so you don’t sign a player in his position. Yes, we like to bring in an older, more experienced midfielder in that position but you always look inside at what you have and don’t have, then you try to bring other players in.

“Lookman is 19. He will not play next week against Manchester City but he will be involved in training and we will see how he improves on this level. It is good that we bring in the boy at this point of the season. That is the best for him and for us. I saw a lot of the young boy. Of course it is a little bit different because young boys are normally part of the scouting in the club but everybody was really enthusiastic about him. I had the information and I agreed with all of them that we needed to sign this young player.”

Koeman confirmed Calvert-Lewin would be out for up to eight weeks with an ankle injury sustained on his full debut against Southampton on Monday. The 19-year-old limped off after 12 minutes of his first Premier League start.

Everton’s manager also said Gerard Deulofeu is unlikely to be sold this month despite the Spain Under-21 captain being linked with a move to Milan or Roma. Deulofeu has not featured since the 3-2 defeat at Watford on 10 December but Koeman said: “At the moment no because of the injury to first [Yannick] Bolasie and second Dominic. Then there is no possibility for Deulofeu at the moment. We have had no approaches.”