Lionel Messi is training alone at Barcelona after picking up a muscle injury just days before the La Liga season continues.It is believed the Argentine ace has a minor right quadriceps injury and has been training in isolation to avoid unnecessary risks.Messi scored 19 goals and set up 12 more in 22 La Liga appearances before the coronavirus pandemic forced the division to shut down in early March.Barca's first game back is away to Mallorca on June 13, before hosting Leganes at the Nou Camp three days later.The Catalans are two points above bitter rivals Real Madrid at the top of La Liga with 11 games still to play.Barca are said to be confident Messi will be fit enough to rejoin his team-mates "in a few days' time".The first team are due.