Chelsea’s plan this summer is to recruit a new top-class goalkeeper at Stamford Bridge. That is according to fresh speculation. The Blues currently own Robert Sanchez and Djordje Petrovic as their two senior options in goal, but there’s been questions marks about both throughout the course of the season. In fact, journalist Simon Phillips claimed via Substack last month that Chelsea have concerns about both Sanchez and Petrovic when it comes to their ball-playing ability. Now, there’s talk that Chelsea could look to raid Portuguese giants Porto for Diogo Costa. Costa, who’s aged 24, is the fir…