Two-time world champion Fernando Alonso has posted on Twitter suggesting he will make an announcement regarding his future in Formula 1 on August 14.The Spanish enigma is once again a hot topic of conversation in the F1 world with his McLaren contract set to expire at the end of the season.There is an option to extend his deal with McLaren for a further year, but considering the team's inability to mount any sort of challenge for race victories or podiums, 2018 may be the year that the Spaniard decides to leave Formula 1 and seek out a new challenge.Alonso made headlines last year when he decided to skip the Monaco Grand Prix to compete in the Indianapolis 500.He barely put a foot wrong in the race but his engine blew out after 130 laps just as he was mounting a charge on the leaders. With his afternoon done, Alonso climbed out of his car and slipped his racing gloves off – a sight all too familiar to Formula One watchers.The McLaren driver did say that he would use the current summer break to contemplate his future in the sport, which may well be a full-time switch to IndyCar in pursuit of claiming the final jewel of the Triple Crown.The former two-time world champion has set social media alight by posting a teaser message on Twitter.

How much you can really read into that one inconspicuous tweet is unclear, nevertheless, there will be a lot of F1 fans dreading to find out exactly what Alonso was teasing.

Some supporters are eager for the Spaniard to jump ship and take the second seat at Red Bull alongside Dutch superstar Max Verstappen, but Christian Horner was quick to squash these rumours last week by stating that although he was an admirer of Alonso, he may not be a 'healthy option' for the Milton Keynes-based outfit considering the 'chaos' he can cause by moving teams.