[6] He played his first match in Pogoń's main team on 6 May 2006 in a goalless draw against Arka Gdynia,[6] during which he came off the bench in 86th minute, replacing Andradina.

[18] In the end of November 2007, he underwent an addiction therapy[19][20] in an rehabilitation center in Stare Juchy,[21][22][23] which lasted for approximately a month.

[38] On 19 April 2009, he helped his team win the match with Ruch Chorzów by scoring the sole goal in that game.

[39] On 8 June 2009, it was announced that Grosicki had signed a three-year contract with Jagiellonia, starting from July 2009,[40][31] for a reported fee of 500,000 PLN.

[31][41] During the winter break, two Swiss clubs FC Aarau and Grasshopper were interested in transferring Grosicki, but were unsuccessful.

[42] Grosicki's second stint abroad was with Süper Lig side Sivasspor, where he was transferred to in January 2011 for approximately €900,000 on a three-and-a-half-year contract.

[44] He scored the first goal of their surprise 2–0 victory over Lille on 27 March, which put Rennes into the semi-finals of the Coupe de France.

[48] On 31 January 2017, Grosicki signed a three-and-a-half-year contract with Premier League club Hull City.

[57] Having represented the Poland national under-21 football team, Grosicki debuted for the senior side in a friendly match against Finland on 2 February 2008.

[58] Grosicki was selected in Poland's squad as it co-hosted UEFA Euro 2012, only appearing on 16 June in the second group match in Wrocław, replacing Eugen Polanski for the final 34 minutes of a 1–0 defeat to the Czech Republic.

[59] Making his 24th appearance on 7 September 2014, Grosicki scored his first two goals for Poland in a 7–0 win away to Gibraltar at the start of UEFA Euro 2016 qualification.

[citation needed] After the match against England in March 2021, he ceased to be appointed by the coach Paulo Sousa and ultimately did not find himself in the wide squad for Euro 2020.