[TheProphet]

Well the action you need to take is based on the degree of injury it is, I.e how severe the pain is.

Grade 1: Pain only after training

Continue training but apply ice or cold therapy to the injury after each training session. Cold therapy can be applied by by ice massage or the use of ice packs. It is important the cold is applied at the point of pain on the tendon.
Wear a heat retainer or support.
See a sports injury specialist / therapist who can apply sports massage techniques and advise on rehabilitation. An eccentric strengthening programme is generally recommended.

Grade 2: Pain before and after exercise but pain reduces once warmed up.

Modify training activities to reduce the load on the tendon. Stop jumping or sprinting activities and replace them with steady running or swimming / running in water if necessary.
See a sports injury specialist / therapist who can apply sports massage techniques and advise on rehabilitation.

Grade 3: Pain during activity which prevents you from training / performing at your best.

Rest completely from the aggravating activity. Replace it with swimming / running in water (if pain allows).
See a sports injury specialist / therapist who can apply sports massage techniques and advise on rehabilitation.

Grade 4: Pain during every day activities which may or may not be getting worse.
Rest for a long period of time (at least 3 months!).
See a sports injury specialist / therapist who can apply sports massage techniques for patella tendonitis / tendinopathy and advise on rehabilitation.
If the knee does not respond to rehabilitation then consult an Orthopaedic Surgeon as surgery may be required.

based on what you said the best thing i think would just be to refrain from heavy jumping based activities like basketball and plyometrics for a few weeks, and regularly apply an ice pack after any activity you do, also invest in a knee support.