Thomson made his competitive debut for Hearts on 27 August 2009 in the Europa League against Dinamo Zagreb; Thomson was named as the man of the match on the official Hearts website. He made his Scottish Premier League debut three days later at McDiarmid Park in a 2–2 draw with St Johnstone, and was again named as the man of the match by the official Hearts website. Thomson earned praise from teammate Marius Zaliukas, and won the SPL young player of the month award for September 2009. Thomson impressed with his crossing ability and delivery from corners and free kicks. On 31 July 2010, Thomson scored two goals with direct free-kicks in a 3–2 victory over Millwall at the New Den in a pre-season friendly. On 23 April 2011, Thomson scored his first competitive goal for Hearts from the penalty spot, as Hearts surrendered a three-goal lead to draw 3–3 with Motherwell at Tynecastle.
Conviction and loans to Lithuania
Thomson was convicted on 17 June 2011 at Edinburgh Sheriff Court after admitting 'lewd, libidinous and indecent behaviour' towards two girls aged 12 and 14. He admitted to showing them male genitalia, asking the older one for sex and engaging them in sexual chat. He was fined £4,000 and placed on the sex offenders register for five years. On 10 July 2011, Hearts announced that Thomson would leave the club imminently, following his conviction. Thomson was loaned to Lithuanian club FBK Kaunas, also owned by Hearts majority shareholder Vladimir Romanov, on 31 July. This meant that Thomson became the first Scottish footballer to play in Lithuania. Thomson played for Kaunas until the end of the 2011 Lithuanian season, in November. He returned to Scotland at the end of the Lithuanian football season in November 2011, but was not invited to train with Hearts. Thomson was unable to play for a club until January 2012 because of the transfer window rules. On 9 March 2012, he returned to the A Lyga, joining FK Sūduva on loan. In August, he returned to Hearts. After making no appearance for the club in the 2012–13 season, Hearts announced that Thomson had been released and cut his £1,500 weekly salary from the club's wage bill.
Career after Hearts
Following his release from Hearts, Thomson moved to Cypriot side AEP Paphos. However, the move broke down after the club found out about his conviction for sexual offences. After being without a club for some time, Thomson returned to the game in March 2014 with local Junior side Arniston Rangers. He moved on to Newtongrange Star in July 2014 and joined Kelty Hearts two years later. Thomson spent one year with Kelty Hearts, helping the side win the SJFA East Superleague title in 2017, before returning to the Scottish football league system with Scottish League Two club Edinburgh City on 3 July 2017.
In June 2011, Thomson was placed on the sex offenders' register for five years and fined £4,000 after he pleaded guilty to two counts of indecent behaviour. The charges were related to "sexual conversations" that he had had with two underage girls over the internet. Despite calls from fans for Thomson to be dismissed, the club after a full investigation opted to allow Thomson to stay at the club, acknowledging that his actions were unacceptable but claiming that there were sufficient mitigating circumstances. Hearts' decision was criticised by the mother of one of his victims and a children's charity, while a water supplier withdrew their sponsorship of the club. Days after their decision to retain Thomson, Hearts suspended him. Hearts announced on 10 July that Thomson would leave the club, following a further disciplinary meeting with majority shareholder Vladimir Romanov. It was not apparent, however, whether Thomson would be released by Hearts, or transferred to another club. On 31 July, he was loaned to FBK Kaunas, another club controlled by Romanov. Thomson returned to Scotland at the end of his loan spell. He was released by Hearts in 2013. In November 2011, Thomson was arrested and charged with grooming offence once again after "trying to lure a 12-year-old girl into meeting up with him more than two years ago." After a year being charged, the Edinburgh Evening News reported that Thomson had been cleared of this charge, due to lack of evidence. In late 2013, Thomson was facing police charge after being reported by Midlothian Council officials for working as an unlicensed window cleaner.
Career statistics
Personal awards and achievements
Scottish Premier League Young Player of the Month: September 2009
