Former Liverpool defender, Mark Lawrenson has tipped Chelsea defender, Thiago Silva, to make a shock summer switch to Manchester United on a free transfer. Earlier this week, Silva announced he will leave Stamford Bridge at the end of the season after four seasons. Despite the fact he will turn 40 in September, the Brazilian has proven he is still capable of operating at the highest level. “I could see Thiago Silva going to another Premier League team in the summer, but the only thing is that he needs to play in a back three. There are teams who play in a three and he’s shown that he can still…