Helmut Marko expects Red Bull to make a "significant step forward" at the Spanish Grand Prix next month after a disappointing start to the Formula One season.
Daniel Ricciardo and Max Verstappen have managed just one podium finish between them in the first three races of the year.
Ferrari already hold a 55-point advantage over Red Bull in the constructors' standings, with Mercedes just three adrift of the Italian team.
Red Bull motorsport consultant Marko is confident the Milton Keynes-based team can make their presence felt after revamping the RB13.
"We have two problems: Renault had some reliability issues, which have slowed them down in the development; and we didn't deliver the chassis that we should have done," he told the official Formula One website.
"But we are working day and night to pick up our shortcomings. We are pretty optimistic that we will make a significant step forward in Barcelona where a big change of parts is coming.
"So sometimes patience is the best virtue a driver can have."
He added: "The chassis will be revamped in Barcelona and Renault is planning something for Montreal."
Marko still thinks Ricciardo and Verstappen can challenge despite a slow start.
He said: "When we fought for the championship with Sebastian [Vettel] against [Fernando] Alonso [in 2012] we were 42 points behind still after the summer break - and won. So we are the masters of catch-up."
21. Mai 2018
|Wane to leave Warriors at end of season|
|Dr Fury will see you now - Tyson plans future career in medicine|
|Harden, D´Antoni rue ´soft´ Rockets performance in Warriors drubbing|
|Liverpool players can change their lives in Kiev, says Gerrard|
|Real Madrid v Liverpool: Can great deeds of the past fuel the bid for Champions League glory?|
|Wash your mouth out! - Curry´s expletive outburst earns scolding from mother|
|Rakitic lost for words as Iniesta heads for Barcelona exit|
|Conte: Chelsea must overhaul squad to change style|
|Johnston: Liverpool can´t lose Suarez, Coutinho and Salah!|
|Messi: I like Griezmann, he´s one of the best|
|Ohtani says he´s not good enough for Home Run Derby yet|
|Mendy: France are eyeing World Cup glory|
|Scott accepts two-week ban for Walker punch|
|Braves rally for six runs in the ninth to defeat Marlins|
|MLS Review: Red Bulls upstage Atlanta thanks to Wright-Phillips brace|
|Warriors breeze past Rockets in game three|
|We have a quality squad – Man City chairman hints at caution in transfer market|
|Wise cruises to maiden PGA Tour victory at Byron Nelson|
|Matic: United can fight for Premier League and Champions League with experience|
|Golden Knights GM on Stanley Cup Finals berth: I don´t know how we did it|
|I did a ´s*** job´ defending LeBron James – Morris|
|Dembele suffers sprained right ankle|
|We know Fellaini´s not going to renew with United – Mirabelli suggests Milan move|
|Cavs´ Lue not satisfied with just one win|
|They even whistled at Torres – Simeone backs Griezmann|
|I arrived as a boy, I leave as a man – Iniesta in emotional Barcelona farewell|
|Lingard: Wembley loss my worst feeling in football|
|Cahill: Conte uncertainty affecting Chelsea|
|Sarri has run out of time – Napoli chief De Laurentiis|
|Barca boss Valverde salutes departing Iniesta|
|I feel like I´ve been run over by a truck or had 15 pints - Crutchlow|
|Four sent off as Ajaccio win chaotic Le Havre play-off on penalties|
20. Mai 2018
|Sweden win shoot-out to retain world title|
|De Vrij penalty was destiny for Inter - Icardi|
|PSG? Maybe one day - Pogba coy over long-term future at Manchester United|
|Messi wins fifth European Golden Shoe|
|Gattuso calls for more malice at Milan|
|Barcelona 1 Real Sociedad 0: Coutinho stunner lights up Iniesta´s farewell|
|Lazio 2 Inter 3: Spalletti´s men seal Champions League qualification with stunning comeback|
|Royals reach play-offs as Kings XI come up short|
|Nadal sees clearly after Rome rain is gone|
|Double whammy for Zverevs as Mischa bows out in Geneva|
|Atletico Madrid pay fitting tribute to tearful Torres|
|Hull FC claim derby spoils, Dragons off the bottom|
|Buzarnescu battles through as McHale impresses in Nuremberg|
|Neymar an artist who will not need special treatment - new PSG coach Tuchel|
|Atletico Madrid 2 Eibar 2: Torres bows out with a double|
|Napoli 2 Crotone 1: Milik and Callejon condemn visitors to the drop|
|Iniesta starts on Barcelona goodbye but Messi rested|
|Nadal rallies after rain break to dethrone Zverev in Rome|
|AC Milan 5 Fiorentina 1: Cutrone brace secures Europa League group stage spot|
|I think I made a fantastic decision - Garoppolo key to Sherman joining 49ers|
|FIFPro appeals to FIFA over Guerrero World Cup ban|
|Neymar made mistake joining PSG - Rivaldo|
|Simple for Simon as outstanding Yates extends Giro advantage|
|Ulster qualify for Champions Cup as Biggar makes history|
|Neymar tired of rumours and staying at PSG, president Al-Khelaifi claims|
|Beaten Halep calms injury concerns ahead of French Open|
|Van der Vaart´s Midtjylland nightmare set to end|
|It has been a crazy ride - Klopp proud of Liverpool ahead of Champions League showdown|
|Raonic pulls out of French Open|
|Liverpool youngster Alexander-Arnold not overwhelmed by England call-up|
|Torres captains Atletico Madrid on farewell|
|Otaegui claims second European Tour win at Belgian Knockout|
|Green: Warriors play best when we feel threatened|
|Daredevils dump out defending IPL champions Mumbai|
|Fan shows off Monk face tattoo on bottom|
|Bayern Munich chief Hoeness rules out spending spree|
|Fury to take on Albanian Seferi in Manchester next month|
|Mourinho mind games won´t distract from Manchester United´s paused progress|