New York Mets pitcher Dillon Gee will remain hospitalized for the next day or two after undergoing surgery for a blood clot in his right shoulder.

Manager Terry Collins, reached in Kansas City, said Gee had experienced numbness in his fingers. After extensive testing Monday, Gee was found to have a clot in an artery which doctors at New York’s Presbyterian Hospital used a catheter to break up.

Gee, 26, will remain hospitalized to ensure the clot is fully resolved.

The team announced Gee, scheduled to start Friday at Atlanta, will be placed on the disabled list and his return to baseball activity is undetermined.

Gee pitched well in his final start before the All-Star break on Saturday, limiting the Chicago Cubs to one run over eight innings in a 3-1 win. The right-hander is 6-7 with a 4.10 ERA in 17 starts.

Gee has been a mainstay in the rotation for the Mets (46-40), who were a bit of a surprise in the season’s first half. They are in third place in the NL East, 4½ games behind the division-leading Washington Nationals.

Collins indicated the Mets likely will promote a reliever to fill Gee’s spot for now, since the fifth starter’s spot won’t be required until as late as July 21.

Collins added the revised rotation probably now has Jonathon Niese starting Friday in Atlanta, followed by R.A. Dickey on Saturday and Chris Young on Sunday. There is the potential for Johan Santana to start Sunday instead, but Collins wants to see how Santana responds to Thursday’s throwing session during a workout at Turner Field.

Santana originally was scripted for the second-half opener, but a twisted right ankle scrapped those plans. Gee was due to take Santana’s spot Friday before he had the medical emergency arise.