Newcastle United have been warned against signing Nicolas Jackson in their pursuit of attacking reinforcements.The Magpies are hoping to put a positive spin on a frustrating summer transfer window by adding extra firepower to their ranks.Nicolas Jackson has been linked with a move to Newcastle this summerGettyBoss Eddie Howe had hoped to field Hugo Ekitike and Alexander Isak up top next season but as it stands it could be Liverpool who do just that.The Reds pipped Newcastle to the Frenchman’s signing all while registering their interest in Isak who has since informed club chiefs of his desire to leave St James’ Park this summer.With the Magpies still without a sporting director following Paul Mitchell’s shock exit in June and Howe’s masterplan seemingly in tatters, an air of trepidation looms over the club.Newcastle’s plan B of luring RB Leipzig striker Benjamin Sesko to the club will not be a free run.It comes after talkSPORT revealed on Tuesday, Manchester United’s interest in the Slovenia international.That leaves Chelsea star Jackson as a likely option to lead the line for Newcastle next season.The Senegalese is likely to see his game time heavily reduced at Stamford Bridge next season following the arrivals of Liam Delap and Joao Pedro, with the latter also a target for the Magpies.Newcastle have been linked with a move for the 24-year-old however talkSPORT’s Alan Brazil has warned the north east club against signing Jackson while offering a few words of advice to the striker.“Nicolas Jackson doesn’t score enough for the chances he has,” the former Ipswich and Manchester United forward told talkSPORT.“He’s a one in four scorer. He’s got a 25 percent strike rate.talkSPORTAlan Brazil was been left disappointed by Jackson’s goal return for Chelsea[/caption]Chelsea are unlikely to stand in the way of Jackson leaving in the event of an offer or loan dealGetty“What does my head in is that he doesn’t look along the line, he gets offside all the time.“When you peel wide, look along the line. Don’t be offside.“It drives you mad. You’re getting out of trouble, the pressure’s off, you’re breaking away and the ball goes wide and he’s offside and you’re back in trouble again.“He’s got to learn. He’s pacy, he tries but he can’t finish. I’m not sure it’s a good move for Newcastle.”Jackson netted 13 times in 37 appearances for the recently crowned Club World Cup winners.That followed his 17-goal haul in his first season at the club after his arrival in August 2023 from Villarreal.Eddie Howe has been left with a huge dilemma just two weeks before the start of the seasonAFPChelsea are understood to value Jackson at around £80m meaning a loan deal is the most likely outcome if he is to leave during the window.Manchester United have also been linked with a move for Jackson as they look to bolster their attacking options.How is Newcastle’s transfer window shaping up?Time is running out for Newcastle who have the addition of Champions League football to contend with next season.The Magpies have secured just one major signing this summer after Anthony Elanga’s £55m move from Nottingham Forest.Newcastle were keen on acquiring Bryan Mbeumo before his eventual move to Manchester United and a £25m bid for his former Brentford teammate Yoane Wissa was rebuffed.They also missed out on goalkeeper target James Trafford who secured a move back to Manchester City this week, with Aaron Ramsdale likely to fill the spot.Howe’s side are currently in the mist of their pre-season preparations as they plan for their season opener against Aston Villa on August 16.Newcastle have lost all three of their pre-season matches so far against Celtic, Arsenal and a K-League XI.