After the arrival of Evaldo Fabiano from S.C. Braga in the 2010 off-season, Grimi became a fringe player for Sporting, appearing in only four official matches during 2010–11 (two in the league, for a total of 253 minutes), and being loaned in the very last day of the 2011 summer transfer window to K.R.C. Genk in the Belgian Pro League.