Chelsea are preparing for a must-win game against Tottenham Hotspur on Sunday in the Premier League. The Blues are winless in their last four games in the league. So manager Thomas Tuchel will be desperate for all three points against Spurs.Meanwhile, Chelsea are preparing a €15 million bid for a Barcelona outcast. Elsewhere, the Blues are plotting a summer move for a Bayern Munich striker. On that note, here's a look at the key Chelsea transfer stories as on 20th January 2022.Chelsea preparing €15 million bid for Ousmane DembeleChelsea are ready to offer €15 million for Frenchman Ousmane Dembele.Chelsea are ready to offer €15 million for Ousmane Dembele, according to journalist Pedro Almeida.Barcelona have announced that they are ready to offload the Frenchman this month. Dembele is in the final year of his current contract, and is reluctant to sign a new deal. The Blues are plotting to take him to Stamford Bridge.Thomas Tuchel's wards were expected to take the league by storm this season. They started well, but their season has gone haywire since then, with much of their struggles attributable to their faltering attack. Chelsea are currently third in the league table after 23 games, 12 behind league leaders Manchester City, who have a game in hand.Pedro Almeida@pedrogva6 Chelsea ready to offer around 15M€ to Barcelona to hire Ousmane #Dembele right now. #CFC #FCB twitter.com/pedrogva6/stat…Pedro Almeida@pedrogva6continue the negotiations between Chelsea and Ousmane #Dembele agent. Barcelona continues try to convince the player stay in club. #CFC #FCB twitter.com/pedrogva6/stat…3:33 AM · Jan 20, 20221776278continue the negotiations between Chelsea and Ousmane #Dembele agent. Barcelona continues try to convince the player stay in club. 🇫🇷 #CFC #FCB twitter.com/pedrogva6/stat…💥 Chelsea ready to offer around 15M€ to Barcelona to hire Ousmane #Dembele right now. 🔵 #CFC #FCB twitter.com/pedrogva6/stat…Chelsea spent a fortune on Romelu Lukaku last summer. Unfortunately, the Belgian has been a disappointmen, scoring only eight times in 23 games across competitions.Timo Werner's struggles also seem to have no end, while Kai Havertz and Hakim Ziyech have not justified their presence in the team either. Tuchel is desperate to bring in reinforcements this month, and Dembele's availability has presented an interesting option for the Blues.The Frenchman has struggled to remain fit at the Camp Nou, but remains one of the deadliest attackers in the world. If Chelsea can manage to keep him injury-free, Dembele could be a superb addition to Tuchel's roster.Barcelona are eager to cash in on him this month, so Chelsea might secure his services on a cut-price deal.Blues plotting summer move for Robert LewandowskiChelsea are planning to move for Robert Lewandowski if the opportunity arises in the summer.Chelsea are planning to move for Robert Lewandowski if the opportunity arises in the summer, according to Caught Offside via Bild.The Blues are long-term admirers of the Polish international. Lewandowski is among the most lethal strikers in the world, and his current contract with Bayern Munich is set to expire in 2023.GOAL@goalBayern Munich are planning to sell Robert Lewandowski this summer if he rejects a new contract, according to Sport Bild 9:58 AM · Jan 19, 2022192601193Bayern Munich are planning to sell Robert Lewandowski this summer if he rejects a new contract, according to Sport Bild 👀 https://t.co/5TFonS1JKXThe Bavarians want to tie him down to a new deal, but Lewandowski could be open to a fresh challenge.If the Polish international fails to agree an extension, the Bundesliga giants might sell him at the end of the season. The London side are keeping tabs on the situation, and hope to rope in Lewandowski to address their attacking woes.Chelsea monitoring Dusan VlahovicChelsea are keeping a close eye on Vlahovic.Chelsea are keeping a close eye on Fiorentina's Dusan Vlahovic, according to 90 Min. The Serbian striker has been heavily linked with a move to Arsenal, who are planning to sign him this month. However, the 21-year-old is not convinced with a move to the Emirates, and is keeping his options open.The Blues are offering him an alternate option. Thomas Tuchel wants a new striker, and is enticed by Vlahovic. However, prising him away could be tough, as there is already intense competition for his signature.