Pressure is piling up for Bayern Munich on and off the field amid speculation about stars Robert Lewandowski and Serge Gnabry while their bid for a 10th straight Bundesliga title is under threat after seeing their lead slashed.Bayern face a tough home tie Saturday against Union Berlin, who are known for grinding out results, while the hosts have defenders Niklas Suele and Benjamin Pavard sidelined respectively by injury and Covid. Lewandowski is fit despite a knee knock in training this week while midfielder Leon Goretzka could come off the bench for his first appearance since December.Over the last week, second-placed Dortmund have cut Bayern’s lead from 10 points down to four with eight games left and Germany’s top two clubs to meet on April 22. Bayern have drawn their last two league games and still need to secure the futures of 2020 Champions League winners with Lewandowski, Gnabry, Manuel Neuer and Thomas Mueller out of contract in 2023. The longer Bayern wait to extend contracts, the more speculation grows.🇪🇺 Top rated players still in the #UCL 1️⃣ Robert Lewandowski 🔴2️⃣ Kinglsey Coman 🔴3️⃣ Leroy Sane 🔴4️⃣ Karim Benzema5️⃣ Vinicius Jnr6️⃣ Alphonso Davies 🔴7️⃣ Riyad Mahrez8️⃣ Joao Cancelo9️⃣ Joshua Kimmich 🔴🔟 Mo Salah😯 That’s a lot of Bayern pic.twitter.com/on8kqFBHWb— WhoScored.com (@WhoScored) March 18, 2022 Lewandowski has 29 Bundesliga goals to his name this season and is on course to be top scorer for the seventh time in nine seasons. Yet his agent Pini Zahavi has told Kicker “there is no contact with FC Bayern yet” amid reports Manchester United want to table an offer. Likewise, Gnabry has scored 13 goals from the wing this season, but is reportedly tempted by a return to former club Arsenal.Sky’s Norwegian pundit Jan-Aage Fjoertoft, who is close to Dortmund star Erling Haaland, claims Lewandowski wants to leave Bayern this summer and Kahn has confirmed he has met with Haaland’s advisor Mino Raiola.Bayern want to discuss contract extensions only once they have secured a tenth straight Bundesliga title, which Hainer says has their “entire concentration” as does their Champions League quarter-final against Villarreal.BUNDESLIGA – ROUND 27FridayBochum – Borussia Monchengladbach 0-2 (0-0)/Plea 55, Embolo 61/SaturdayGreuther Furth – Freiburg 0-0 Hertha – Hoffenheim 3-0 (1-0)/Stark 39, Belfodil 63, Tousart 74Mainz – Bielefeld 4-0 (1-0)/Burkardt 1, 75 pen, Niakhate 65 pen, Ingvartsen 79 pen/Stuttgart – Augsburg 3-2 (1-2)/Anton 44, Marmoush 79, Tiago 85 – Hahn 6, Gregoritsch 45+1/20:30: (1.20) Bayern (7.25) Union Berlin (12.0)Sunday17:30: (1.48) RB Leipzig (4.50) Eintr.Frankfurt (7.75)19:30: (3.05) Wolfsburg (3.40) Leverkusen (2.45)21:30: (3.35) Koln (3.45) Dortmund (2.15)***odds are subject to change