Chelsea ace Romelu Lukaku has struggled to find consistency since his sensational return to Stamford Bridge last summer. While injuries and COVID-19 have played a part, Thomas Tuchel's inability to find the perfect attacking partner for the Belgian could also be a reason for his poor form.Football journalist and pundit Matt Law came to the conclusion after crunching some data to figure out who could play alongside the big striker to great effect.Speaking to London is Blue podcast, he revealed that Kai Havertz is an excellent fit for Big Rom:“I get the impression, and this is from a little bit of information and a little bit of guess work, that if you asked Lukaku who would you play with, he’d say Kai Havertz.”Tuchel's constant rotation policy has seen Lukaku play alongside a variety of attackers, including Christian Pulisic and Hakim Ziyech.London Is Blue Podcast ⭐️⭐️@LondonBluePod🗣“I would like to see a bit more of Lukaku and Kai Havertz playing together. It could be in a front 3, but maybe in a 2.I thought early in the season, there were seedlings of a good little partnership between Havertz and Lukaku in the 3-5-2 type thing.”— @Matt_Law_DT9:41 AM · Jan 20, 202212715🗣“I would like to see a bit more of Lukaku and Kai Havertz playing together. It could be in a front 3, but maybe in a 2.I thought early in the season, there were seedlings of a good little partnership between Havertz and Lukaku in the 3-5-2 type thing.”— @Matt_Law_DT https://t.co/RwFFcopiQDThe trio started in their key Premier League encounter against Manchester City but the Blues lost the match 1-0 with none of the attacking triumvirate impressing. However, when Lukaku is joined by the aforesaid German, it's a different story. In six matches together, both players have produced results.Lukaku scored in their wins over Arsenal and Aston Villa, including a brace in the latter fixture, while Havertz scored in their draw with Liverpool and the win over Tottenham Hotspur. Based on this evidence, Chelsea stand to benefit when Tuchel plays two of their most expensive stars together.The Belgian cost them a club-record fee of £97.5 million from Inter Milan while Havertz was snapped up from Bayer Leverkusen for £72 million the previous year.Chelsea must realise Lukaku is used to playing with a goalscoring companionOne look at Lukaku's record at Inter Milan will tell you how comfortable Lukaku is while playing with a strike companion. The Belgian forged one of Europe's most menacing attacking partnerships with Lautaro Martinez over a two-year span.Squawka Football@SquawkaRomelu Lukaku and Lautaro Martinez have been directly involved in 100 Serie A goals between them since the start of the 2019/20 season. ◉ 78 goals ◉ 22 assists A lethal partnership. 5:30 AM · Aug 8, 20211145110Romelu Lukaku and Lautaro Martinez have been directly involved in 100 Serie A goals between them since the start of the 2019/20 season. ◉ 78 goals ◉ 22 assists A lethal partnership. 🔫 https://t.co/gLXc2znc2mTheir understanding on the pitch was excellent and they got along incredibly well under Antonio Conte's wing. Lukaku and Martinez even played a crucial role in helping the Nerazzurri to their first Scudetto in 11 years, accruing 41 league goals between them.But at Chelsea, the 28-year-old hasn't had that luxury yet, as he's often left to fend himself off. However, as Law pointed out, playing the Belgian alongside Havertz could unlock his real potential once more and Tuchel would be wise to follow the advice.