By Sean Walsh Chelsea have announced the signing of striker Marc Guiu from Barcelona. The Blues triggered the £5m release clause in Guiu’s Barca contract last week and he has now finalised his move to Stamford Bridge. A club statement read: “Chelsea is pleased to announce the signing of striker Marc Guiu from FC Barcelona. “The Spaniard has agreed a five-year deal with the Blues, which includes a further one-year option, and will join up with his new teammates for pre-season.” Guiu told Chelsea’s club channels: “It’s an immense joy to sign for Chelsea and I struggled to sleep ahead of the jour…