The Stewart-Haas Racing team has announced that Max Papis will take over driving duties in the #14 car at this weekend's NASCAR Sprint Cup Series race at Watkins Glen International in place of the injured Tony Stewart.

Papis has competed in F1, CART, IndyCar and all three NASCAR national-level championships over the years, and last month claimed the GT class win in the Brickyard Grand Prix race in the GRAND-AM Rolex Sports Car series. Papis even tested Stewart's Cup car last week at Road Atlanta in Braselton, Georgia, making him the obvious short-notice replacement for the team.

Stewart is currently in hospital after a four-car crash in a sprint car race on Monday night at Southern Iowa Speedway in Oskaloosa, Iowa. Stewart sustained a broken tibia and fibula in the crash, but was awake and talking to track workers as he was stretchered away. The team confirmed that he had not suffered any other injuries, other than the double fracture of his right leg.

Stewart underwent preliminary surgery overnight at a local hospital to stabilise what was described as a Grade 2 injury. However, the team announced that Stewart would require further surgery on the injury - likely to insert a rod into the leg to help the fracture set correctly - and that he would remain in hospital in the meantime.

There was no indication of how long Stewart would be in hospital for overall, or when it might be feasible for him to return to racing. One medical expert said that an injury of this type typically takes four to eight weeks "before people can get real active again," and that the usual course of treatment includes blood thinners to reduce the risk of clots in the patient while he or she has limited mobility. NASCAR would not normally allow someone on such medication to race because of the risk of haemorrhaging in the event of being involved in an accident.

In the meantime, the three-time Cup champion posted a brief message to fans on his Facebook page via his mobile phone: "I told someone to go get my phone or else I was going to get up and get it myself," he wrote. "Finally got reconnected to the world and just want to say thank you for all the prayers and well wishes. My team will remain strong and I will be back."

The accident could hardly have come at a worse stage of the NASCAR Sprint Cup season. There are only five races remaining before the Chase cut-off that decides who is still in the running for the 2013 championship. Currently in 11th place in the standings, even if he missed only one race Stewart is now highly unlikely to finish in the top ten that would put him into the title play-offs.

Instead, Stewart will be hoping to claim one of the two 'most wins' wildcards to get him through to the Chase. That needs him to be one of the two drivers with the most wins in the rest of the top 20 after next month's race at Richmond; currently Stewart has one win to his name after clinching victory in June's race at Dover International Speedway.

Two other drivers outside the top ten also have one win apiece - Martin Truex Jr. (14th) and Stewart's own team mate Ryan Newman (15th). If both drivers finish ahead of Stewart, he would miss the cut. Other scenarios include Greg Biffle (currently in tenth place with one win) dropping out of the top ten and taking up one of the wild cards, or one or more of the other winless drivers outside the top ten such as Brad Keselowski or Kurt Busch winning a race in the next month.

Stewart is a five-time winner at the eight-turn, 2.454-mile Watkins Glen International road course. He had been one of the favourites to pick up an additional 2013 race win this weekend that would have bolstered both his bid for a top ten position and his claim to a backup wildcard if needed

His stand-in Max Papis is also very familiar with Watkins Glen and is a very experienced road course racer. This weekend's race will mark Papis' 36th Sprint Cup outing but his first start in the series since he finished 41st at Michigan International Speedway in late 2010. Papis' best Cup result was at Watkins Glen when he finished in 8th place in 2009, and the 43-year-old Italian also has three top-five finishes on the Nationwide Series at road course races in Montreal or at Road America.

Papis' outing at Road America this year with Richard Childress Racing featured contact with rival driver Billy Jones, and afterwards Papis made his displeasure known by slapping Jones' helmet. He's due to be in action again this weekend at Road America in the GRAND-AM race, and will have to commute to the Glen in New York State for the Cup sessions in the #14 car.

The team posted an Instagram picture of Papis having a seat-fitting at the Stewart-Haas team facility on Tuesday.

As a road course specialist, Papis is unlikely to be handed the car for any further outings even if Stewart is still sidelined for the August 18 event at the two-mile Michigan speedway that follows Watkins Glen.