Andrea Grillini has hit out at a 'lack of motivation' from Santiago Barragan following announcement that the two parties have gone their separate ways.

Following a handful of appearances over the years, Barragan made his full-time World Superbike debut with the Grillini Kawasaki team in 2015 and has broken into the points on five occasions with a best race finish of 11th.

However, following the Laguna Seca round of the World Superbike Championship, the Spaniard has exited the team, a move that has drawn the ire from the eponymous team owner

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"Lack of motivation. This is the reason why Santiago Barragan decided to leave the WSBK with four rounds to go," read a team statement.

"A really complicated season," added Grillini, who lost Christophe Ponsson to Pedercini earlier in the year. "I always make all possible resources of the team available to my riders however this season, each time for different reasons. I had to face difficult situations that did not allow the Team to give its best and to work in serenity.

"I will not comment the decisions taken by the riders, but I want to say that, once again, enthusiasm and the desire to move forward win. Enthusiasm is what I found in Gianluca Vizziello who was not afraid to get involved in WSBK."

Barragan will be replaced for the remainder of the season by Australian rider Alex Phillis, who has experienced of racing at Superstock level in the German IDM series and completed a wild-card World Supersport run for Lorini Honda earlier this year

"To be offered to ride the last four rounds of WSBK is privilege and a great opportunity for me. I am going to take it with two hands and do my best to really make something special of it. Cannot wait!"