Yoane Wissa is pushing to leave Brentford and is disappointed an exit has not been sanctioned. The striker is now refusing to train as he looks to force an exit.Brentford have today informed Newcastle United that Wissa is not on the market even though talkSPORT understands they are actively looking for a replacement.GettyWissa has been left disappointed by Brentford’s decision on his future[/caption]The Bees have told Newcastle the forward is not for sale this summerGettyNewcastle communicated to Brentford they were willing to raise a rejected £25million offer to £30m-fixed with around £5m in add-ons. But Brentford responded saying Wissa is not available, and have indicated to all interested clubs that only £50m+ make the deal happen.Wissa has just one year left on his current contract, but Brentford have a club-option to extend it by another 12 months, and this informs their high valuation.Wissa is understood to be disappointed by the price being asked, and believes Brentford have broken a verbal pact last summer allowing him to leave for around £26m. Last summer, Wissa even agreed not to ask for improved terms believing he could depart in 12 months.Wissa had several options last summer but told Brentford he was prepared to stay an extra year following the departure of Ivan Toney to Al-Ahli and a subsequent knee injury to Igor Thiago. And he reiterated his loyalty again in the winter.He went on to score 20 goals in all competitions last season, giving his word to Brentford he would remain 100 per cent committed providing an exit was sanctioned this summer.At 29, Wissa wants to play Champions League football for a big club and believes it may be the last chance in his career to do so. This was communicated to Brentford in face to face talks over his future in London after Wissa left Brentford’s pre-season tour in Lisbon.Wissa reiterated to Brentford’s hierarchy he wishes to leave, and will not sign a new contract, but to his disappointment Brentford have today informed Newcastle they must meet a £50m+ valuation.Brentford consider the door shut. Wissa is still holding out hope of a resolution. Talks are ongoing between the two clubs.The Bees have already lost manager Thomas Frank to Tottenham and star forward Bryan Mbeumo to Manchester United in a deal worth £71million this summer. GettyWissa scored 20 goals in all competitions last season to attract interest from elsewhere[/caption]Bryan Mbeumo has already left the club, with Brentford desperate to keep WissaGettySince joining the club from Lorient in 2021, the forward has scored 49 goals and provided 13 assists in 149 appearances.He did not feature in their latest pre-season fixture in Portugal.In Wissa’s absence, the Bees faced Gil Vicente in a friendly to conclude their tour on Friday night.Thiago cancelled out an early goal from the Portuguese outfit as the match ended in a 1-1 draw.Following the match, manager Keith Andrews reflected on the performance, explaining: “I was pleased, overall, really pleased.“The week, in general, has been geared towards this game. The plan was always to play the majority of players for 45 minutes in two different halves.“The first half had the more senior players playing, getting to know each other, things we’d worked on in training, maybe not to the level we wanted, but it’s pre-season and that’s why we’re working on it. “Second half, I was slightly disappointed with the start, we were a bit passive, but then we got a grip of the game and the last half-hour we were solid.“The younger team out there will gain confidence from that – they looked dangerous and kept them relatively quiet coming the other way.”Brentford will now return to England for matches against Queens Park Rangers and Borussia Monchengladbach before the season starts.Andrews’ side kick-off their Premier League campaign away to Nottingham Forest on August 17.